We have been given a triangular prism. We are asked to find the volume of a prism that is 3 times as large.
The sides of base of triangular prism and height of new prism would be 3 times the sides and height of original prism.
![\text{Base length}=3* 3=9](https://img.qammunity.org/2021/formulas/mathematics/high-school/7l7w4zy7bbf2ee7cqb32ygvsfesjw4h428.png)
![\text{Height}=3* 5=15](https://img.qammunity.org/2021/formulas/mathematics/high-school/z0uli5jb7edmh37ogpvd87c5ai4apenh9c.png)
We can see that base of prism is a right triangle, so base length will be 9 and height of triangle will be 9 as well.
![\text{Area of base}=(1)/(2)* 9* 9](https://img.qammunity.org/2021/formulas/mathematics/high-school/yvpowvgmkvoebaw1swh8njwjk6gxggbqpp.png)
![\text{Area of base}=(1)/(2)* 81](https://img.qammunity.org/2021/formulas/mathematics/high-school/9cciea3r1hinzuond2yejb2spe7ii701al.png)
![\text{Area of base}=40.5](https://img.qammunity.org/2021/formulas/mathematics/high-school/lnanjgo1ahzbhfyyk9c5muawrckovuau5g.png)
Volume of prism would be base area times height of prism.
![V=bh](https://img.qammunity.org/2021/formulas/mathematics/high-school/km7no2ixss91n2kfi41ny1gxzdra8g4zsw.png)
![V=40.5* 15](https://img.qammunity.org/2021/formulas/mathematics/high-school/noy6bewqv0det6gye2crpmvo8jaql3lv7e.png)
![V=607.5](https://img.qammunity.org/2021/formulas/mathematics/high-school/cb2nixg8a41ho7ifylc5y6hu91bgwkhcjz.png)
Therefore, the volume of the prism that is 3 times as large as given prism would be 607.5 and option D is the correct choice.