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The comound ratio of 3;4and the inverse ratio of4;x findx

comound ratio??
compound ratio is equal to some thing ? give the data
sorry formula
what do u think of my answer? is it right



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Compound ratio of  a : b   and    c : d   is   a * c :  b * d  
Inverse ratio of    a : b   is   b : a

    so  3 : 4  and  inverse ratio of 4 : x  is  the compound ratio of 3 : 4 and x : 4
     3 * x  : 4 * 4 = 3 x : 16

How do we find x ?  what is this compound ratio equal to ? 

1 5 1
3/4=x/4 if solved. Then x=3
0 0 0
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