If a line is passing through a pair of parallel straight lines and it divides the the parallel lines in a ratio the ratio??

The quantity of parallel lines must be 3 for this application.This hypothesis is called block hypothesis where at least 3 lines are caught by transversals. 

 

It expresses that, if 3 parallel lines converge 2 transversals then the portions caught on the transversals are corresponding. 

 

for e.g., if the parallel lines are cut by transversals and proportion in which first transversal cuts the 2 parallel lines is a:b and the second one cuts them in c:d, at that point 

 

=>a:b = c:d 

 

=>a/c = b/d [Ans]