Question

a, b, c, d are in proportion. a=2, b=15, c=4,d=?​

Answer 1

We know that , (product of extremes=product of means)

so, a×d=b×c

or,

2×d=15×4

or ,

2×d=60

or,

d=60/2 =30

thus ,the value of d is 30