**Are the following numbers in proportion: (i) 32, 40, 48 and 60 ? (ii) 12,15,18 and 20 ?**

###### Answers:

(i) 32, 40, 48 and 60 are in proportion

if 32 : 40 = 48 : 60

if 32 x 60 = 40 x 48

if 1920 = 1920

Which is true.

32, 40, 48 and 60 are in proportion

(ii) 12, 15, 18 and 20 are in proportion

if 12 : 15 = 18 : 20

if 12 x 20 = 15 x 18 {ad = bc}

if 240 = 270

which is not true.

12, 15, 18 and 20 are not in proportion.