Year 8 maths · B.12 · Proportional relationships
Solve proportions: find the missing value
Cross-multiply, then divide to get x on its own.
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Solve the proportion for x: 3/8 = x/32
Answer: 12
Solve the proportion for x: 9/5 = x/20
Answer: 36
Solve the proportion for x: 7/6 = x/36
Answer: 42
Tip: Cross-multiply, then divide to get x on its own.
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- Next in this topic Solve proportions with x in any position Year 8
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