It's the point located past ' 1 ' and a hair more than 1/3 of the way
(actually 7/20 of the way) from ' 1 ' to ' 2 '.
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135% (of a certain number) = 540, therefore 100% (of a certain number) = 100 x 540/135 = 400 The missing number is 400.
1,3,5,9,15,27,45,135
.135
135
It is 15