Fourth or Forth: Meaning, Usage and Examples

Have you ever paused while writing because you could not decide between fourth and forth? The confusion is understandable: the two words sound the same in standard English, but they have different spellings, meanings, and uses. The good news is that the distinction is quite simple. Fourth is connected to the number four, while forth generally means forward, onward, or outward. Once you connect each spelling with its meaning, choosing the right word becomes much easier.

Fourth vs. Forth: The Key Difference

The easiest way to distinguish these words is to look at what they refer to.

Word	Meaning	Example
fourth	Number four or fourth in order	She finished fourth.
forth	Forward, onward, or outward	The soldiers marched forth.

Fourth is an ordinal number. It tells you where something falls in a sequence: first, second, third, fourth, fifth.

Forth is primarily an adverb associated with movement or continuation. It appears particularly often in fixed expressions such as back and forth, go forth, set forth, and and so forth.

So, if you can replace the word with “number four” or “fourth in order,” choose fourth. If the idea is “forward” or “onward,” choose forth.

What Does “Fourth” Mean?

Fourth is the ordinal form of four. It describes something that occupies position number four in a sequence.

For example:

• Today is the fourth day of the month.
• He lives on the fourth floor.
• Maya was the fourth person to arrive.
• This is my fourth attempt at solving the problem.
• Our team finished fourth in the tournament.

The word can also be a noun referring to one of four equal parts:

• She ate a fourth of the pie.
• Divide the mixture into fourths.

In this sense, fourth remains connected to the number four.

Common phrases with “fourth”

You will often see the word in expressions such as:

• fourth place
• fourth grade
• fourth floor
• fourth quarter
• fourth chapter
• fourth attempt
• fourth time
• the Fourth of July

For all of these, the spelling with four- is required because the word refers to four or a position based on four.

What Does “Forth” Mean?

Forth generally means forward, onward, or outward. It is more common in established expressions than in ordinary modern conversation.

Examples include:

• The travelers set forth before sunrise.
• She stepped forth to receive the award.
• The ship sailed forth into the open sea.
• The speaker called forth a new idea.

The word is especially familiar in phrases such as back and forth, where it describes movement in opposite directions.

You may also encounter forth in formal or literary expressions such as from this day forth, meaning “from this day onward.”

Is It “Back and Forth” or “Back and Fourth”?

The correct expression is:

Back and forth ✅

Not:

Back and fourth ❌

“Back and forth” describes movement from one direction to another and then back again. It can describe physical movement or repeated exchanges.

Examples:

• The children ran back and forth across the garden.
• We went back and forth about which restaurant to choose.
• The curtains moved back and forth in the breeze.
• They exchanged messages back and forth throughout the afternoon.

Why is it forth? Because forth carries the idea of moving forward or onward. The phrase pairs back with that forward movement.

What About “And So Forth”?

Another frequent spelling mistake is “and so fourth.”

The correct phrase is:

and so forth ✅

It means and so on and indicates that a list or series continues.

For example:

• The course covers grammar, punctuation, vocabulary, and so forth.
• We need chairs, tables, decorations, and so forth.
• She talked about her work, hobbies, travel plans, and so forth.

Here, forth has nothing to do with the number four. Therefore, “and so fourth” is incorrect in standard English.

Is It “Fourth Grade” or “Forth Grade”?

When referring to Grade 4, the correct spelling is:

fourth grade ✅

For example:

• My son starts fourth grade this fall.
• The fourth-grade students are preparing for a school play.

Forth grade is incorrect in this context because the word identifies the fourth level or position in a sequence.

The same rule applies to:

• fourth place, not forth place
• fourth floor, not forth floor
• fourth chapter, not forth chapter
• fourth attempt, not forth attempt

If you are describing a position associated with the number four, use fourth.

Why Are These Words So Easy to Mix Up?

The main reason is pronunciation. Fourth and forth are homophones in standard English: they are pronounced alike or nearly alike but have different meanings and spellings.

When people hear a word rather than see it written, there is no spelling clue telling them which form is intended. This can lead to mistakes when writing familiar expressions from memory.

The extra u in fourth is meaningful because it connects the word visually with four.

Compare:

four → fourth

That connection does not exist in forth, whose meaning is related to forward movement or continuation.

Easy Way to Remember the Difference

Use this simple association:

FOUR → FOURTH

If the sentence involves 4, use fourth.

She came fourth in the race.

FORTH → FORWARD

If the sentence involves moving forward or onward, use forth.

The explorers moved forth.

This trick also makes common expressions easier to remember:

• back and forth = back and forward
• and so forth = and so on
• set forth = set out
• go forth = go forward or onward

Common Mistakes to Avoid

Here are several errors worth watching for:

1. “Back and fourth”
Incorrect. The established expression is back and forth.

2. “And so fourth”
Incorrect. The phrase is and so forth.

3. “Forth place”
Incorrect when referring to a competition ranking. Write fourth place.

4. “Forth grade”
Incorrect when referring to Grade 4. Write fourth grade.

5. “Set fourth”
Usually incorrect when the intended phrase is set forth, meaning to present, state, or begin a journey.

A useful test is to ask yourself: Am I talking about four, or am I talking about forward movement?

If it is four, choose fourth. If it is forward or onward, choose forth.

Examples in Sentences

Seeing the two words side by side makes the distinction clearer:

• She finished fourth in the race.
• The runners moved forth toward the finish line.
• This is the fourth chapter of the book.
• They walked back and forth along the beach.
• He lives on the fourth floor.
• The explorers set forth at dawn.
• We discussed the budget, schedule, staffing, and so forth.
• It was her fourth attempt to solve the puzzle.

Notice that the spelling changes according to meaning, not pronunciation.

Frequently Asked Questions

Is it forth or fourth?

Both words are correct, but they are used differently. Fourth refers to the number four or the fourth position in a sequence. Forth means forward, onward, or outward and commonly appears in expressions such as “back and forth” and “set forth.”

Is “back and fourth” ever correct?

No, not when you mean movement or repeated exchange. The standard expression is “back and forth.” For example, “The two friends argued back and forth.” The spelling fourth would only be appropriate when referring to the number four or fourth position.

What is the meaning of fourth or forth?

Fourth means number four in a sequence or one of four equal parts. Forth generally means forward, onward, or outward. They sound alike but have different meanings and spellings.

Is “and so forth” or “and so fourth” correct?

And so forth is correct. The expression means “and so on” and is used when a list continues. “And so fourth” is a spelling error unless fourth is being used in some completely different context.

How can I remember fourth vs. forth?

Connect fourth with four: four → fourth. For forth, think forward. If you mean number four, choose fourth; if you mean forward or onward, choose forth.

Final Verdict: Fourth or Forth?

The choice depends entirely on meaning. Fourth is the word for number four and the fourth position, while forth expresses forward or onward movement and appears in phrases such as back and forth and and so forth. Remember FOUR → FOURTH and FORTH → FORWARD, and you will rarely confuse them again. For more clear, practical word distinctions, Grammarify helps you know the difference and use the right words.

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