Question

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

Answer 1

we are missing a picture I presume

Answer 2

nope

Answer 3

we are missing something...

Answer 4

calistar something's missing in your problem for sure...:D

Answer 5

srry thats the way the problem is, no pic no nothing ..thanxx anyway=)

Answer 6

a/d=c/b(that's wrong)

Answer 7

aha I think I got it, one equality written in four ways, so which is false...if a/b=c/d than it's not possible that a/d=c/b

Answer 8

I get it
they each become
ad=bc
bc=ad
ab=cd
ad=bc

so the third one