PLEASE HELP ME!! SPAMMERS WILL BE BLOCKED !!

The ratio of sides will be same
[tex]\\ \sf\longmapsto \dfrac{x}{2}=\dfrac{5.4}{3}[/tex]
[tex]\\ \sf\longmapsto \dfrac{x}{2}=1.8[/tex]
[tex]\\ \sf\longmapsto x=1.8(2)[/tex]
[tex]\\ \sf\longmapsto x=3.6[/tex]