Question 20007
Is this problem complete?  You state that the ratio of BC is 1/2, but you don't state what that is in relationship to.


First, let's draw the line based on the information given:
AB:AC::1:4
BC:CD::1:2
A-B---C------D


Without doing any calculations and just inspecting the line segments we can see that CD is 6 times as long as AB.  So, my guess is that AB:CD::1:6.  I hope that is right?