Hey all, I'm stuck on this current divider problem. It's just killing me, I've been trying to solve it for an hour and a half now. I've combined and uncombined the circuits in about all the ways possible but I just can't get the right answer. Can someone help me out?
Here's the problem setup:

Is: 14.25 mA R1= 71k ohms R2= 21k ohms R3= 4k ohms R4 = 65k ohms R6= 31k ohms R7 = 34k ohms and R8 = 76k ohms

 

Start by lumping R3,R4,R6,R7 & R8 together as a single value.

This value is 68.834k

R1 & R5 play no part in the current distribution.

So I2=14.25mA*68.834/(21+68.834)=10.919mA.

Now find the current in R4 since you know I2.

You then look at the current division of the current in R4 between the parallel combination R3||(R6,R7 & R8 combined) to deduce I3.

And so on ....

 

Post your work ....