From the properties of similar triangles:
The ratio of corresponding sides of similar triangle are always equal
In the given triangle :
The corresponding sides ratio is:
[tex]\frac{12}{4}=\frac{8}{?}=\frac{15}{5}[/tex]Simplify the above expression and solve for "?"
[tex]\begin{gathered} \frac{12}{4}=\frac{8}{?}=\frac{15}{5} \\ \frac{8}{?}=\frac{15}{5} \\ \text{Apply crossmultiplication:} \\ 8\times5=?\times15 \\ \text{? = }\frac{8\times5}{15} \\ \text{? = }2.66 \end{gathered}[/tex]So, ? = 2.66
Answer : 2.66