three quantities x, y and z are such that xy=kz where k is constant. initially, x was at 4 and x:y:z was 2:3:4. if the value of y is changed to 12 and z is kept constant, find the value of x.

three quantities x, y and z are such that xy=kz where k is constant. initially, x was at 4 and x:y:z was 2:3:4. if the value of y is changed to 12 and z is kept constant, find the value of x.