Question
If p is the fourth proportion to 4, 9 and 8, and q is
the third proportional of p and 30, then find the mean proportional between 32 and q.Solution
ATQ: 4: 9 :: 8 : p 4p = 9 × 8 p = 18 18: 30 :: 30 : q 18q = 30 × 30 q = 50 mean proportion of 32 and 50 = √(32×50) = √1600 = 40
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