Question

Are 15,9,5,3 in proportion? justify.

Answer 1

15:9::5:3
product of mean=product of extreme
9*5 =15*3
45=45
yes, they are in proportion

Answer 2

yes they are in proportion
$\frac{5 } {3} = \frac{15}{9}$
the product of 5, 9 and 3, 15 are equal that is 45