Helene drove 70 km on 4 L of gasoline. Which proportion would help determine how far she can travel on a full 30 L tank of gasoline
70/4=30/x
70/30=x/4
70/4=x/30
30/70=4/x
70/4=30/x
70/30=x/4
70/4=x/30
30/70=4/x