Question 95219
{{{(cross(b)*(c))/((a)*cross(b))=96/48=2}}} 
so c=2a
{{{ac=a*2a=2a^2}}}
{{{2a^2=72}}}
divide 2 into each side{{{a^2=36}}}
take square root of both sides a=6 a=-6
Positive numbers are required so a=6 is an answer.
ac=6c=72
c=72/6=12
ab=6b=48
b=48/6=8
Check: bc=8*12=96
EdJones