Final answer:
To solve the proportion (4)/(7) = (15)/(x) for x, cross multiply by multiplying the numerator of one ratio by the denominator of the other. Simplify the equation to find x = 105/4.
Step-by-step explanation:
To solve the proportion (4)/(7)=(15)/(x) for x, you can cross multiply. Cross multiplying involves multiplying the numerator of one ratio by the denominator of the other ratio. In this case, you would have 4*x = 7*15. Simplifying this equation gives you 4x = 105. To solve for x, divide both sides by 4, which gives you x = 105/4.