Question

12 : 68:: 30:?
(i) 176
(ii)180
(iii)218
(iv)222
​

Answer 1

Answer:

170

Step-by-step explanation:

formulae of proportion is means×extreams

68×30=12×?

2040=12×?

2040/12=?

2040/12=170

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Answer 2

Answer:

• 170.

Step-by-step explanation:

We have,

• 12 : 68 :: 30 : x

We know,

Product of means = Product of extremes

Hence,

⇒ 12 × x = 68 × 30

⇒ 12x = 2040

⇒ x = 2040/12

⇒ x = 170

∴ The fourth proportion is 170.

Verification:

Product of means = Product of extremes

⇒ 12 × 170 = 68 × 30

⇒ 2040 = 2040

∴ L.H.S = R.H.S