Proportion Calculator

Smart Proportion Calculator for solving proportions, ratios, and cross multiplication problems quickly with accurate instant results.

Proportion Type

"If A equals B, then C equals X"

0

Direct: As A increases, B increases proportionally.

Calculated Solution

Value of X0
Calculation Formula
X = (20 × 15) / 10
Ratio A:B1 : 2
Percentage Change150%

Step-by-step:

  • Identify that A and B have a linear relationship.
  • Multiply the new value (C) by the original output (B).
  • Divide the result by the original input (A) to find X.

Direct Proportion

Use this for situations where both values increase together (e.g., more items = higher cost). Based on the mathematical Rule of Three for linear scaling.

Inverse Proportion

Perfect for tasks where an increase in one value leads to a decrease in the other (e.g., more workers = less time required). Essential for project management and resource planning.