Algebra 1 Companion Book, Vol 1 – Summer Edition

2.2.1 Rates, Ratios, and Proportions (continued)

Example 4 Solving Proportions In the proportion =

a b c d , the products a ⋅ d and b ⋅ c are called the cross products. The cross products of a proportion are equal to one another, ad = bc . This fact can be used to find missing values within a proportion.


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