All of the following are equivalent proportions except
a/b = c/d
b/a = d/c
d/b = c/a
c/d = b/a

Answer with Step-by-step explanation:

dividing both sides by a and multiplying both sides by d, we get

d/b=c/a

Multiplying both sides by bd , we get

ad=cb

Now dividing both sides by ac, we get

d/c=b/a

or b/a=d/c

Hence, a/b = c/d  , b/a = d/c  and d/b = c/a are equivalent

Hence, Correct option is:

c/d = b/a

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