Simplify ratios, find missing values, check if ratios are proportional, and scale recipes, maps, and measurements.
a : b = c : d — leave one blank
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A ratio compares two or more quantities. The ratio 3:2 means "for every 3 of one thing there are 2 of another." Ratios can be simplified by dividing both parts by their GCF.
A proportion states that two ratios are equal: a/b = c/d. Cross-multiplication: a×d = b×c. Used extensively in cooking, maps, scale models, and engineering.