Question

9. Find the fourth proportional to it .
(ii) 2 1/2 , 1 1/2 , 2.2​

Answer 1

21/2 : 11/2 : : 22/10 : x

product of means = product of extremes

11/2×22/10 = 21/2× x

121/10 = 21/2 x

x = 121/10 × 2/21

x = 121/105

Answer 2

Answer:

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