Question

determine which of the following are in proportion:

a) 18,36,9,18
b) 14,35,16,40
c) 80,32,60,24
d) 72,18,64,12​

Answer 1

Answer:

a , b & c are in proportion

Step-by-step explanation:

If a : b = c : d are in proportion then a/b = c/d

i.e. ad = bc

Product of extremes = Product of means

This is called ross product rule

(a) 18,36,9,18

• 324 = 324
• Here ad = bc
• Hence it is in proportion

(b)  14,35,16,40

• 560 = 560

• Here ad = bc

• Hence it is in proportion

(c) 80,32,60,24

• 1,920 = 1,920

• Here ad = bc

• Hence it is in proportion

(d) 72,18,64,12

• 864 ≠ 1,152
• ad ≠ bc
• Hence it is not in proportion