Ratios & ProportionsHESI A2 cheat sheet

Setting up the cross-multiply

7 key facts Reviewed Oct 2026

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Ratio

A comparison of two quantities: 3:4, 3/4, or 3 to 4
Simplify like a fraction

Proportion

Two equal ratios: a/b = c/d
Solve by cross-multiplying: ad = bc

Setup

Keep the same unit on the same level on both sides
Label every number before solving

Uses

Scaling recipes, map distances, and dosage calculation

Key takeaway

Setting up the cross-multiply

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