8/3=36/d
4/n=15/10
15/4=9/2r
9/4n=1.5/7
n-3/16=5/8
7/8=35/w-1
Proposition???? Hmmmm! <g>
I'll bet you mean proportion!
Cross multiply and solve for the unknown number.
8/3=36/d
8d = 108
d = 13.5
4/n=15/10
15n = 40
n = 2.666667
Now solve the other problems the same way.