The Proportion Calculator helps you solve a proportion a/b = c/x for the missing value. Simply fill in the fields above and click Calculate to get an instant result.
This calculator is part of Calculate Wiki’s Math Calculators collection.
What You’ll Need
- A
- B
- C
Formula Used
Given A/B = C/X, solve: X = (B × C) ÷ A
Example Calculation
Using example inputs — A = 2; B = 4; C = 10 — the Proportion Calculator returns:
| Value | Result |
|---|---|
| Solved for X | 20 |
X = 20. 2 / 4 = 10 / 20
Helpful Information
Results from the Proportion Calculator are estimates based on standard formulas used in the math calculators field. For projects with significant cost, health, or safety implications, consider verifying results with a qualified professional.