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What is the proportion equivalent to X/Y...

What is the proportion equivalent to `X/Y : Y/Z : X/Z," if "X : Y : Z = 4 : 7 : 9 `?

A

`36 : 49 : 32`

B

` 16 : 21 : 14`

C

`36 : 51 : 28`

D

`36 : 49 : 28`

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