Q9. If a : b = 3 : 4, b : c = 2 : 3, c : d = 1 : 2, find the value of ((a+b+c+d)/(b+d))^½
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a : b=3 :4
b : c=2 : 3=4 : 6
a : b : c =3 : 4 : 6
c d =1 : 2 =6 : 12
a : b : c : d= 3 : 4 : 6 : 12
let a=3k
b=4k
c=6k
d=12k
{(a+b+c+d)/(b+d)}^1/2
={(3k+4k+6k+12k)/(4k+12k)}^1/2
={(25k/16k)}^1/2
=(25/16)^1/2
={(5/4)^2}^1/2
=5/4
=1 1/4
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