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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