[tex]\frac{4}{3}[/tex]
one fraction over another fraction represents division of the fractions, that is
[tex]\frac{1}{3}[/tex] ÷ [tex]\frac{1}{4}[/tex]
To divide the fractions
leave the first fraction
change division to multiplication
turn the second fraction upside down
= [tex]\frac{1}{3}[/tex] × [tex]\frac{4}{1}[/tex] = [tex]\frac{4}{3}[/tex]