A 10 -foot vertical pole casts an 8 -foot shadow, shown below. Tom needs to find the height of a pole that casts a 12 -foot shadow. An image shows two similar right triangles. The first triangle represents the 10-foot pole that casts a 8-foot shadow; the legs of the triangle are labeled 10 and 8. The second triangle represents a pole with an unknown height that casts a 12-foot shadow; the legs of the triangle are labeled H and 12. Which proportion could be used to find the second pole's height