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# Find Two Numbers Such that the Mean Mean Proportional Between Them is 12 and the Third Proportional to Them is 96. - ICSE Class 10 - Mathematics

#### Question

Find two numbers such that the mean proportional between them is 12 and the third proportional to them is 96.

#### Solution

Let a and b be the two numbers whose mean proportional is 12

∴ ab = 12^2 => ab = 144 => 144/a ....(1)

Now third proportional is 96

∴ a : b : : b : 96

=> b^2 = 96a

=> (144/a)^2 = 96a

=> a^3 = (144 xx 144)/96

=> a^3 = 216

=> a = 6

b = 144/6 = 24

Therefore the number are 6 and 24.

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#### APPEARS IN

Selina Solution for Selina ICSE Concise Mathematics for Class 10 (2018-2019) (2017 to Current)
Chapter 7: Ratio and Proportion (Including Properties and Uses)
Ex.7B | Q: 14

#### Video TutorialsVIEW ALL [1]

Solution Find Two Numbers Such that the Mean Mean Proportional Between Them is 12 and the Third Proportional to Them is 96. Concept: Proportions.
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