Question

if a proportion the first, third and fourth terms are 80 , 30 and 24 respectively. find the second term?

Answer 1

80:x::30:24
80/x=30/24
x=80×24/30
x=64

Answer 2

a:b::c:d
a=80
b=X
c=30
d=24


a/b=c/d
80/X=30/24
80×30=X×24
80×30/24=X
10=X. ANS.