Proportion Calculator
Find the unknown value when three terms of a proportion are known. Leave one field empty.
How to use
Enter three values, leave the fourth empty; it is solved.
Formula
A/B = C/D → cross-multiplication.
Examples
- 2/3 = 4/x → x = 6
Important notes
Exactly one field must be empty.
Frequently asked questions
What is a proportion?
Two equal ratios.