Question

If a, b, c and d are in proportion, then

ac = bd
ab = cd
ad = bc
a = b

Answer 1

Answer:

ad=bc is the right answer

Answer 2

ad = bc is the correct option.

Given:

a,b,c,d are in proportion

To Find:

The correct option

Solution:

We are required to find the correct equation in the given options.

It is given a,b,c, and d are in proportion.

Let the two ratios a:b and c:d are in proportion, then it can be written as

∵   a:b::c:d

The product of means(a:b) is equal to the product of extremes(c:d).

So from the above proportion, a:b is equal to c:d

⇒ a:b = c:d

⇒ a/b = c/d

⇒ad = bc

Therefore, ad = bc is the correct option.

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