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Find the missing number of 3:9 = N:12

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Anniecaviz


3:9 = n:12
3(n)=9(12)            # 9X12=108
3(n)=108
108/3                   #108 divided by 3
=36                      # the final answer is 36


the missing number is 36 so 3:9 = 36:12

check:    3(36) = 9 (12)
                 108=108    #they are thesame

hope its help..........
DON"T DELETE THIS
Decodexxx345viz
its a ratio and proportion
this symbol ":" represent "is to"
if 3:9 = 4:12
if 3 is to 9 then 4 is to 12

prove
3/9 = 0.33
4/12= 0.33

:)