比例計算機

共有リンク

はじめに

Proportion Calculator — Solve a/b = c/d for any missing term. Enter A (leave blank if unknown), B (leave blank if unknown), C (leave blank if unknown), D (leave blank if unknown) to get an instant, accurate result.

計算式

Solves a/b = c/d for whichever single value is left blank, by cross-multiplication.

ステップごとの説明

Enter the A (leave blank if unknown).
Enter the B (leave blank if unknown).
Enter the C (leave blank if unknown).
Enter the D (leave blank if unknown).
Click Calculate to see your result instantly.

実例

Example: With A (leave blank if unknown) = 2, B (leave blank if unknown) = 4, C (leave blank if unknown) = 6, the Proportion Calculator gives Missing: d, Value: 12.

よくある質問

How many values do I need to know?

Exactly three — leave the one you want solved for blank.

What is cross-multiplication?

For a/b = c/d, cross-multiplying gives a×d = b×c, which is rearranged to solve for the missing value.

What inputs does the Proportion Calculator need?

You'll need to provide: A (leave blank if unknown), B (leave blank if unknown), C (leave blank if unknown), D (leave blank if unknown). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Proportion Calculator?

The Proportion Calculator applies the formula exactly as calculated — Solves a/b = c/d for whichever single value is left blank, by cross-multiplication. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Proportion Calculator free to use?

Yes, the Proportion Calculator is completely free, requires no signup, and runs instantly in your browser.