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Q.

In proportion, the 1st, 2nd, and 4th terms are 51, 68, and 108 respectively. What is the 3rd term?


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a

7

b

81

c

61

d

10 

answer is B.

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Detailed Solution

Given, the 1st, 2nd and 4th terms of a proportion are 51, 68 and 108 respectively.
Let the third term be x.
So, 51:68:: x:108.
We know that the product of extremes = the product of means.
So, 51×108=68×x.
x=550868
x = 81
Therefore the third term is 81.
Hence, option 2 is correct.
 
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