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MissPhiladelphia
I believe the correct answer from the choices listed above is the third option. All of the following proportions are equivalent except a/d=c/b. 

a/b=c/d

b/a=d/c => a/b = c/d


a/d=c/b not equal to a/b = c/d

a/c=b/d => a/b = c/d

The concept of ratio and proportion is applied.

The correct one is ad = bc.

Thus, option c is not equivalent to proportional.

What are ratio and proportion?

A ratio is an ordered couple of numbers a and b, written as a/b where b can not equal 0. A proportion is an equation in which two ratios are set equal to each other.

Let, the ratio will be

[tex]\rm \dfrac{a}{b}=\dfrac{c}{d}[/tex]

It can be written in different forms are as follows

  1. [tex]\rm \dfrac{a}{b}=\dfrac{c}{d}[/tex], is correct.
  2. [tex]\rm \dfrac{a}{c}=\dfrac{b}{d}[/tex], is correct.
  3. [tex]\rm \dfrac{b}{a}=\dfrac{d}{c}[/tex], is correct.
  4. [tex]\rm \dfrac{a}{d}=\dfrac{c}{b}[/tex], is not correct. The correct one is ad = bc.

Thus, option c is not equivalent to proportional.

More about the ratio and proportion link is given below.

https://brainly.com/question/165414

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