Question

which of these is in proportion
a) 15,45,40,120
b) 4,6,11,12
c) 1,2,3,4
d)2,3,4,5​

Answer 1

☁️ Answer:-

Option a) 15,45,40,120 is in proportion. ✔

☁️ Explanation:-

Let 'ad' be the first and the fourth proportion while 'bc' as the second and the third proportion. Then,

∴ ad = bc

 ⠀ ━━━━━━━━━━━━━━━━━━━━━━

☁️ Now, Solving:-

(a) 15,45,40,120

→ 15×120 = 45×40

→ 1,800 = 1,800

→ L.H.S = R.H.S

→ Hence, they are in proportion. ✔

 ⠀ ━━━━━━━━━━━━━━━━━━━━━━

(b) 4,6,11,12

→ 4×12 = 6×11

→ 48 = 66

→ L.H.S ≠ R.H.S

→ Hence, they are not in proportion.

 ⠀ ━━━━━━━━━━━━━━━━━━━━━━

(c) 1,2,3,4

→ 1×4 = 2×3

→ 4 = 6

→ L.H.S ≠ R.H.S

→ Hence, they are not in proportion.

 ⠀ ━━━━━━━━━━━━━━━━━━━━━━

(d) 2,3,4,5

→ 2×5 = 3×4

→ 10 = 12

→ L.H.S ≠ R.H.S

→ Hence, they are not in proportion.

 ⠀ ━━━━━━━━━━━━━━━━━━━━━━

Answer 2

Answer:

• 15 , 45 , 40 , 120 .are in proportion.

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