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

User Anton Unt
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2 Answers

4 votes
4/5 = 9/x
cross multiply
4x = 45 <===
User Scott Sz
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2 votes

Answer:


4\cdot x=45

Explanation:

We have been given a proportion
(4)/(5)=(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:


(4\cdot x)/(4)=(45)/(4)


x=11.25

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

User PhilMacKay
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8.9k points

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