Ratio and Proportion Calculator
Solve a:b = c:x for the unknown x.
x (unknown)20
How it is calculated
x = b × c ÷ a for direct proportion.
Worked example
| x (unknown) | 20 |
FAQ
Inverse proportion?
Use x = a × b ÷ c.
Are the results exact?
Results are estimates for information only; check official sources for binding figures.