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# 7.2: Proportion Properties

Difficulty Level: At Grade Created by: CK-12
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### Vocabulary Language: English

TermDefinition
Cross Products To simplify a proportion using cross products, multiply the diagonals of each ratio.
Cross-Multiplication Theorem The Cross-Multiplication theorem states that if $a, b, c$ and $d$ are real numbers, with $b \ne 0$ and $d \ne 0$ and if $\frac{a}{b} = \frac{c}{d}$, then $ad = bc$.

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