Ratio of 4 to 9

Ratio of 4 to 9

A ratio of 4 to 9 can be written as 4 to 9, 4:9, or 4/9. Furthermore, 4 and 9 can be the quantity or measurement of anything, such as students, fruit, weights, heights, speed and so on.

A ratio of 4 to 9 simply means that for every 4 of something, there are 9 of something else, with a total of 13.

In the box below, you can enter a number in either box and we will calculate the other number to keep the ratio of 4 to 9. In other words, we will calculate the corresponding equivalent ratio of 4:9 for you.


To calculate the left side of the ratio, our calculator multiplies the right side by 4 and then divides the product by 9. To calculate the right side of the ratio, our calculator multiplies the left side by 9 and then divides the product by 4. Answers are rounded to two decimals if necessary.

Below is a list of equivalent ratios of 4:9 that we created using our 4:9 ratio calculator above.













We have also created a pie chart for you to put 4:9 ratio in perspective. To do so, we divided a pie into 13 pieces and then colored 4 pieces green and 9 pieces blue. The pie will look exactly the same using any equivalent ratio of 4:9.

4 to 9 pie ratio

The green part of the pie covers 30.77% and the blue part covers 69.23%. To calculate the percentages, we divided each side of the ratio by its total and then multiplied by 100, like this:

(4 / 13)×100 ≈ 30.77
(9 / 13)×100 ≈ 69.23

In fractional terms, 4/9 of the pie above is colored in green. This means that the ratio of 4 to 9 or 4:9 can also be expressed as a fraction, where the 4 to the left of the colon is the numerator and the 9 to the right of the colon is the denominator:

4:9 = 4/9

Ratio is often used when defining rectangles in width:height format. Width and height can be feet, inches, centimeters, or any other kind of length. With a ratio of 4 to 9, the width is 4 and the height is 9. Below is a picture of what a rectangle with a ratio of 4:9 looks like.

4 to 9 pie rectangle

Since the simplest form of the fraction 4/9 is 4/9, the simplest form of the ratio 4:9 is also 4:9.

Ratio Calculator
Need information about another ratio? Here you can submit another ratio for us to explain.


Ratio of 4 to 10
Go to the next ratio on our list that we have detailed information about.

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