\(\frac{1}{4}\) = \(\frac{3.2}{x}\)
Cross multiply..
1x = 12.8
Divide 1 from both sides
\(\frac{1x}{1}\) = \(\frac{12.8}{1}\)
x = 12.8
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Let's check our answer now..
\(\frac{1}{4}\) = \(\frac{3.2}{12.8}\)
Cross multiply
12.8 = 12.8
Your answer is 12.8 :)