Question

find fourth propotional of 30 32 42

Answer 1

put 30:33::42:X
now product of extreme = product of mean
30×X =33×42
X=33×42÷30
X=44.4

Answer 2

let the fourth proportional Be X .
30:32: :42:x

30× x = 32×42

x = 32×42
----------
30
x = 16×14
--------
5
x = 224
------- .answer
5



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