What should come in place of question mark (?) in the following number series ?
4, 6, 9, 13.5, 20.25, 30.375, ?
1.5 is multiplied to each number
4 $$\times 1.5$$ = 6
6 $$\times 1.5$$ = 9
9 $$\times 1.5$$ = 13.5
13.5 $$\times 1.5$$ = 20.25
20.25 $$\times 1.5$$ = 30.375
30.375 $$\times 1.5$$ = 45.5625
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