If x : y = y : z, then x2 : y2 is :
1 : x
x : y
x : z
z : x
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If (3x - 9) : (5x + 4) is the triplicate ratio of 3 : 4, find the value of x.
If x, 2, 10 and y are in proportion, the values of x and y are respectively :
0.2 and 0.25
0.2 and 50
0.4 and 50
0.4 and 25