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Math A Review
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Ratio and Proportions
Ratio Sum Problems:
1. Write the ratio as an algebraic ratio. ex. Find the
two numbers in the ratio 4:5 whose sum is 18. 4x:5x
2. Set up equation and solve. 4x
+ 5x = 18 9x = 18 x = 2
3. Find each value by substituting back into the algebraic
ratio 4x=4(2)=8 and 5x=5(2) = 10
Solving Proportions: Product of Means equals Product of
the extremes
Direct Variation
1) Write the ratio to compare
2) Set up equal ratios
3) Solve proportion
Percents
Similar Triangles
Ratio of Sides equals the Ratio of the perimeters.
Ratio of Areas equals the Ratio of the sides squared.
Right Triangle Proportions
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