Question

Which equation could use to solve x in the proportion 4/5=9/x

Answer 1

Answer:

$4\cdot x=45$

Step-by-step explanation:

We have been given a proportion $\frac{4}{5}=\frac{9}{x}$. We are asked to find the equation that could be used to solve for x.

To solve for x we will cross multiply our given equation as:

$4\cdot x=5\cdot 9$

$4\cdot x=45$

Now we will divide both sides of our equation by 4 as:

$\frac{4\cdot x}{4}=\frac{45}{4}$

$x=11.25$

Therefore, the equation $4\cdot x=45$ could be used to find the value of x.

Answer 2

4/5 = 9/x
cross multiply
4x = 45 <===