Have I been wrong in calculating my outs.....

[Abu Turab]

I've been working through Petriv's book and also read Matros' article on odds in Card Player. Until now I have been doing the following for a flush draw: after the flop 47/9 and after the turn 46/9. But after doing the calcualtion based on Petriv's book, my turn is calc is 1.86/1 vs 4.2/1(47/9) thus I have been pricing myself out of draws. Which is the the correct way to use the calculation?