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

Hello,
Answer C

a/b=c/d==>ad=bc
b/a=d/c==>bc=ad ok
a/d=c/b==>ab=cd not ok
a/c=b/d==>ad=bc ok

Answer 2

All of the following proportion are equivalent except option Option C .

`(a)/(d) = (c)/(b)`

Explanation:

Proportion states that the two equivalent ratios or fractions are equal.

Let w , x , y and z are in proportion,

if the two quantities is equal to the ratio of two last quantities.

i.,e
`(w)/(x) = (y)/(z)` iff
`wz = xy`

Option A:

`(a)/(b) = (c)/(d)`

By cross multiply we get;

`ad = bc`

Option B :

`(b)/(a) = (d)/(c)`

By cross multiply we get;

`bc= ad`

Option C:

`(a)/(d) = (c)/(b)`

By cross multiply we get;

`ab = cd`

Option D:

`(a)/(c) = (b)/(d)`

By cross multiply we get;

`ad = bc`

Therefore, all of the following in the given options are proportion except option C