Given:
Length of sides of smaller triangle = 4 and x
Lengths of larger sides = 10 and 25
Let's solve for the value of x.
Since both triangles are similar, the corresponding sides will be proportional.
To solve for x, apply the proportionality equation:
![(10)/(4)=(25)/(x)](https://img.qammunity.org/2023/formulas/mathematics/college/fs7torgmdxoft666q17nfwlo2i35bj8y45.png)
Cross multiply:
![\begin{gathered} 10x=25*4 \\ \\ 10x=100 \\ \\ \text{ Divide both sides by 10:} \\ (10x)/(10)=(100)/(10) \\ \\ x=10 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/qy9h2qumgfpw3bk8yksuaqx6hi2wdr5oeq.png)
Therefore, the value of x is 10.