Three-Part Ratio Calculator
Easily compare, simplify, and scale three quantities simultaneously. Enter any three numbers to find their simplest ratio form using greatest common divisor reductions, see exact percentage breakdowns, and scale proportions.
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What is a Three-Part Ratio?
A three-part ratio (written as A : B : C) compares three distinct quantities simultaneously. Unlike standard two-part ratios, a three-part ratio maintains mutual proportionality across three terms, making it essential for recipes, chemical formulations, concrete mixes, and multi-partner equity sharing.
Simplifying a three-part ratio involves finding the Greatest Common Divisor (GCD) of all three numbers and dividing each term by that common factor. For example, the ratio 12 : 18 : 24 shares a common divisor of 6, simplifying cleanly down to 2 : 3 : 4.
使用される計算公式・方程式
この計算ツールは5つの主要な公式を使用しています：
1 Three-Term Ratio Simplification ▼
Find the GCD of numbers A, B, and C, then divide each term by the GCD to express the ratio in simplest integer form.
2 Proportion Percentage Formula ▼
Determine the exact fractional share of each component relative to the whole by dividing each part by the sum of all three parts.
3 Three-Part Scaling Multiplier ▼
Multiply each ratio term by a constant scaling factor to expand or reduce the total amount while preserving perfect proportionality.
Explore all calculation options on the 比率計算ツール home page.
比率計算ツールの使い方
この比率計算ツールは、以下の3ステップで簡単にご利用いただけます：
数値を入力
入力欄に既知の比率の値を入力します。求めたい未知数の入力欄は空欄のままにしておきます。
モードを選択
比率モード（解く、簡素化、スケーリング）を選択します。各モードで異なる計算式が適用されます。
結果を確認
計算するボタンを押します。結果画面に答えと、視覚的な比率バー、円グラフ、詳細なステップバイステップの解決プロセスが表示されます。
実例問題と段階的な解説
本比率計算ツールを使って、以下の3つの例題をステップバイステップで解決するプロセスです：
入力 1 Simplify 45 : 60 : 75
入力 2 Calculate percentage distribution for 2 : 3 : 5
入力 3 Scale 3 : 2 : 1 recipe for 600 grams total
よくある質問 (FAQ)
How do you simplify a three-number ratio? ▼
Find the greatest common divisor (GCD) of all three numbers, then divide each of the three terms by that common number.
Can a ratio have three parts? ▼
Yes, ratios can compare three, four, or any number of quantities written with colons like A : B : C.
How do you divide an amount into three parts using a ratio? ▼
Add the three ratio numbers together to get total parts, divide your total amount by the sum of parts to find one unit part, then multiply each ratio number by that unit value.
What if one of the three numbers in a ratio is a fraction? ▼
Multiply all three terms by the least common multiple (LCM) of the denominators to clear all fractions into whole numbers.
How do you convert a 3-part ratio to percentages? ▼
Add the three terms to find the total parts, then divide each term by the total parts and multiply by 100%.