Question

2. Find the fourth proportional to the numbers: (i) 8, 36,6​

Answer 1

Answer:

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 cross product rule

Let the fourth proportion be 'x'

8 : 36 : 6 : x

8x = 36 × 6

8x = 216

x = 27

Hence the fourth proportion is 27

Answer 2

Let the fourth number be x

then,

=8:36::6:x

We know that

product of extremes = product of means

∴ 8×x=36×6

8x=216

x=216/8

x=27

Hence x=27