Question

find the fourth proportional to


8.1 , 1.2 , 2.7

Answer 1

let he fourth proportional be x
we know that sum of means = sum of extremes
therefore,fourth proportional is 0.4

Answer 2

HI
HERE IS THE ANSWER
LET THE FOURTH PROPORTION BE X
8.1:1.2:2.7:X
MULTIPLY ALL NUMBERS BY 10 TO REMOVE DECIMAL .
81:12:27:10X
81×10X=12×27
810x=12×27
x=12×27/810=312/810
x=52/135