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Can you find the missing number in the above series?
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You can do this in excel or manually as follows:

27     diff

54      27     diff

86      32      5       diff

128     42     10      5        diff

187     59     17       7        2        diff

272     85     26       9        2         0

Your number is 128

6 Answers

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27 54 86     187 272

   27  32   x    y 85

        5    10 15 30

5^2+5, 5^2+60 in between terms-5^2+17=42 so, next  term is 42+86=128
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128 is the missing no. I am nit so good to explain how i got it. I do mental calculations. You can verify scientifically by means of a net. 
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The number 9 [3] is absent from the series 27, 54, 86, __, 187, and 272. The sum of three consecutive even integers (72) and the product of those three integers (13728) can be used to find this number, which is a component of a sequence that includes every other positive, odd integer [3].
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125 ...........................................................................................................................................................................
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So, here what is missing is we gonna find by doing basic arithmetics. hence, The missing number in the series 27, 54, 86, __, 187, 272 is 128. The pattern is +27, +32, +32, +101, +85.
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 27, 54, 86, __, 187, and 272. The sum of three consecutive even integers (72) and the product of those three integers (13728) can be used to find this number, which is a component of a sequence that includes every other positive, odd integer [3].
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