Question

Find the third proportional to the numbers 5 and 10.

Answer 1

Answer:

Third proportion of 5 and 10 is 20

Step-by-step explanation:

Third proportion of a and c:

The third proportion of two numbers a and c is denoted to be that number 'b' such that

a : c = c : b

Here,

Let a = 5 , c = 10,

Third proportion of 5 and 10 be 'b'

=> 5 : 10 = 10 : b

=> 5 × b = 10 × 10

/* Product of extremes = product of means */

=> b = 100/5

=> b = 20

Therefore,

Third proportion of 5 and 10 is 20

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Answer 2

we will take 3rd proportional as x

5:10::10:x

5×x =10×10

10×10/5

=20

So, the 3rd proportional is 20 ...

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