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Find an equivalent ratio, and then set these fractions equal in a proportion and determine the missing value by using cross-multiplication. How can a ratio be expressed? A ratio can be represented in three ways. For example, the same comparison could be expressed as 4 boys to 7 girls, 4...
To solve for x infractionswe have to eliminate the denominator by cross multiplication and then solve for x. For example, x/4 + 1/2 = 5/2 ⇒ (2x+4)/8 = 5/2 By doing cross multiplication we get, 2(2x + 4) = 8(5)
The horizontal method is used if there is a common multiple between both numerators or denominators. The diagonal method, cross-multiplication, can be used with any portion of the proportion is missing.Proportions Proportions are equations that state two ratios are equivalent. Ratios are comparisons...
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