The value of x in the proportion is x = 39/8
<h3>How to solve the proportion?</h3>
The proportion is given as:
3/8 =x/13
Cross multiply
8 * x = 3 * 13
Evaluate
8x = 39
Divide by 8
x = 39/8
Hence, the value of x in the proportion is x = 39/8
Read more about proportions at:brainly.com/question/1781657
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80 would be your answer for this question
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