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Question

Find the mean proportional between:
(i) 3 and 27
(ii) 0.9 and 2.5

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Solution

(i) 3 and 27
Here the mean proportional between them
= (3×27)
By multiplication
= 81
= 9

(ii) 0.9 and 2.5
Here the mean proportional between them
= (0.9×2.5)
Multiplying and dividing by 10
= (9/10×25/10)
So we get
= 225/100
= 15/10
= 1.5


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