The answer is:  " 2 " . __________________________________________________ Note:  Given:  6:1::12:x ;  Solve for "x" ; Rewrite as: 6/1 = 12/x ; 6x = (12)*(1) ; 6x = 12 ; Divide EACH SIDE of the equation by "6" ; to solve for "x" ; 6x / 6 = 12 / 6 ;   x = 2 . _______________________