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Y and x have a proportional relationship, and y = 15 when x = 3. What is the value of x when y = 4?

User Brenjt
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In a proportional relationship, x and y will increase at the same rate. In order to find the value of x when y=4, we first have to find the ratio of x:y. We can do this by creating a fraction. After we know the ratio, simply replace the y value with 4 and solve for x. Here's the math:

y=15 when x=3 given values

y/x = 15/3 = 5 ratio of y to x

y=5x equation representing the proportional relationship

4=5x replace y with 4

4/5=x divide both sides by 5 to isolate x

Answer: The value of x=4/5 when y=4.

Hope this helps!


User Iivannov
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