solve the proportion 42/15 = ?/10
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Cross multiply.
42/15 = ?/10
15? = 420
? = 28
To solve the proportion 42/15 = ?/10, we can use the concept of equivalent fractions.
First, set up the proportion with the given numbers on one side and the unknown number represented by a variable on the other side:
42/15 = x/10
To solve for x, we need to cross-multiply. This means multiplying the numerator of one fraction by the denominator of the other fraction:
42 * 10 = 15 * x
Simplify:
420 = 15x
Next, divide both sides of the equation by 15 to isolate x:
420/15 = x
Simplify the left side:
28 = x
Therefore, the missing value x in the proportion 42/15 = ?/10 is 28.