In the figure of the truss bridge ∆ABC ~ ∆XYC with BC = 9 ft., CY = 3 ft., XC = 5 ft., and XY = 4 ft. What is the ratio between the length of AC¯¯¯¯¯¯¯¯ and the length of XC¯¯¯¯¯¯¯¯ ?