Calculate missing values in proportions and solve ratio problems quickly and accurately.
A proportion shows that two ratios are equal. This calculator finds the missing value by using cross multiplication.
Example:
3 / 6 = 5 / X
3 × X = 6 × 5
X = 10
| 2 : 4 = 3 : X | X = 6 |
| 5 : 10 = X : 20 | X = 10 |
| 4 : 8 = 6 : X | X = 12 |
A proportion is an equation that shows two ratios are equal.
You can solve proportions by using cross multiplication to find the unknown value.
Yes, it can calculate any missing value in a proportion equation.
Yes, this online calculator is completely free to use.