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Everyday Math Calculator
Everyday arithmetic, reviewed October 2026 — exact for the inputs typed, not a substitute for certified measurement or medical advice.
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Given three parts of a proportion a : b = c : x, the missing value falls out by cross-multiplication: x = b × c ÷ a. With 4 : 200 = 6 : x, the answer is 200 × 6 ÷ 4 = 300 — the fast, exact way to scale a recipe, a map, or a mix to a new quantity without trial portions.
Place the known ratio in A and B (4 servings → 200 g flour), then the new quantity in C (6 servings) to solve for its match. The pairs must stay aligned — swapping which side is which silently changes the answer. For kitchen scaling, keep units identical on both sides before dividing.
It does not reduce the result to simplest form, convert units between the pairs, or handle inverse proportion — divide that out yourself when more of one means less of the other.
Direct proportion only — pairs must stay aligned.
Yes — set the original quantity against the original servings, then solve for the quantity at your target servings.
It solves for the missing term; reduce the result by hand if you want the simplest form.
Same mathematics, different layout: use this when you think in a:b = c:x form, the rule-of-three page when you think “if this gives that.”
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