algebra
posted by Brian .
For this problem a/a1 a1/a=4 .
Is the answer a=1 1/2. I solved it by multiplying a(a1) both side as suggested by bobpursley. thanks

check it:
1.5/.5  (.5)/1.5=4
31/3 does not equal 4
so, that is not the solution.
recheck. Or better yet, graph it to check. I see two solutions, on at a=.18 about, and one about X.3. Graph
x/(x1)  (x1)/x 4