数学

比率計算機

比を簡略化し、比例問題を解く

Fill in 3 of the 4 values — the missing one is calculated automatically.

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Enter any 3 values to find the 4th
使い方
  1. The ratio is expressed as A : B = C : D.
  2. Type any 3 of the 4 values. Leave the value you want to find blank.
  3. The missing value is computed instantly using cross-multiplication.
  4. Use the Clear button to reset all fields.

計算式

Proportion (cross-multiplication):

A/B = C/D ⟺ A × D = B × C

To find a missing value:

  • Missing A = (B × C) / D
  • Missing B = (A × D) / C
  • Missing C = (A × D) / B
  • Missing D = (B × C) / A