SOLUTION: What is the missing number in the proportion 4 : n = 3 : 9
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Question 742432: What is the missing number in the proportion 4 : n = 3 : 9
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
4 : n = 3 : 9
4/n = 3/9
4*9 = 3n
36 = 3n
36/3 = n
12 = n
n = 12
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