Rule of three calculator
Find the fourth value in a direct proportion.
- , -Your receipt will appear hereFix the value in red to update the result.
ADVERTISEMENT300 × 250
ADVERTISEMENT728 × 90320 × 100
How does it work?
Step 1Enter A and its corresponding value B.
Step 2Enter C in the same unit as A.
Step 3Calculate X in the same unit as B.
X = B × C / A
Frequently asked questions
If A corresponds to B, then C corresponds to X = B × C / A.
This page handles direct proportions only. In an inverse proportion the product remains constant.
Yes, both decimal commas and points are accepted. A must be nonzero.