\[\frac{3}{4} = \frac{45}{60};\ \ \frac{15}{12} = \frac{25}{60};\ \ \frac{4}{15} = \frac{16}{60};\ \ \]
\[\frac{7}{20} = \frac{21}{60}\text{\ \ }\]
\[\Rightarrow \frac{4}{15},\ \frac{7}{20},\frac{5}{12},\frac{3}{4}.\]