Instructions

What should come in place of the question mark (?) in the following number series?

Question 171

8 52 ? 1287 4504.5 11261.25 16891.875

Solution

8 52 x 1287 4504.5 11261.25 16891.875

Clearly , $$\frac{52}{8}$$ = 6.5

$$\frac{4508.5}{1287}$$ = 3.5

so x must be such that it should give a value of 5.5 & 4.5 with 52 and 1287 respectively.

Hence , x = 52*5.5 = 286

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