Proportion Calculator

Solve a/b = c/x for the missing value.

x 12

Formula: a/b = c/x → x = b·c ÷ a

Step-by-step with your numbers:

1. Values used:

2. a = 2

3. b = 3

4. c = 8

6. x = 12

Did we solve your problem today?

Find the unknown term in a proportion (cross-multiply).

The math behind it

From a/b = c/x, cross-multiply: x = b × c ÷ a.

2/3 = 8/x → x = 12.

Use?

Scaling recipes, maps and similar shapes.