a ∶ b = 4 ∶ 9 మరియు b ∶ c = 3 ∶ 7 అయితే, a ∶ b ∶ c ని కనుగొనండి.

1
4 ∶ 6 ∶ 19
2
2 ∶ 9 ∶ 4
3
4 ∶ 9 ∶ 21
4
3 ∶ 5 ∶ 8

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