Proportion (Direct Proportion) Calculator
Calculate the unknown in the proportion a/b = c/x.
Result
12
a/b = c/x → x = 12
Result in all units
Step-by-step solution
What Is a Proportion Calculation?
A proportion is the equality of two ratios. In direct proportion, as one increases the other increases; in inverse proportion, as one increases the other decreases. It is used in scale and recipe calculations.
How is it calculated?
How Is It Calculated?
Direct proportion: a/b = c/d → the unknown is found by cross-multiplication.
- Enter the three known values.
- Unknown = (cross product) ÷ remaining value.
Frequently Asked Questions
How does inverse proportion work?
In inverse proportion the products are equal: a × b = c × d; as one increases the other decreases at the same rate.