 # 9/4 30/x

## Enter proportion values below:

 ---------- =<≤>≥ ----------

 9 4
 =
 30 x

## Define the proportion formula:

If 2 proportions are equal to each other, then we can cross multiply to get:
 Numerator 1 Denominator 1
 =
 Numerator 2 Denominator 2

Numerator 1 * Denominator 2 = Denominator 1 * Numerator 2

## Solving for Denominator 2 we get:

 Denominator 2  = Denominator 1 * Numerator 2 Numerator 1

## Evaluating and simplfying using your input values we get:

 x  = 4 * 30 9

 x  = 120 9

x = 13.333333333333

x = 13.333333333333

### How does the Proportion Calculator work?

1) Calculates the missing link of 2 equivalent proportions or ratios.
2) Also determines if two numerical proportions that you entered such as 1/10=6/12 are equivalent or not equivalent. Note: You can use all allowable operators such as =,<,≤,>,≥
This calculator has 4 inputs.

### What 3 formulas are used for the Proportion Calculator?

1. a/b=c/d

For more math formulas, check out our Formula Dossier

### What 3 concepts are covered in the Proportion Calculator?

equivalent
equal in value, amount, function, meaning
proportion
n equation in which two ratios are set equal to each other
a/b = c/d
ratio
indicates how many times one number contains another