A CCTV camera was installed on the roadside. A suspected person was caught on the CCTV doing something illegal. The height of the person in CCTV footage/monitor is 4 cm. The CCTV camera was installed at a distance of 17 meters from the suspected person. Can you find the original height of the suspected person?
If you know the original height of another person is 5 feet, and if the person is caught on the same CCTV from the exact same spot, then the height of the person in CCTV footage/monitor is 3.7 cm, then can you find the height of the suspected person using proportion?
I shall assume that the CCTV thingy is a pinhole camera. The 'law' followed by a pinhole camera can be stated as: $$\frac{h_r}{h_i} = \frac{z_r}{f}$$ where $h_r, h_i$ are the heights of the person in real-world and image resp., $z_r$ is the distance from the camera and $f$ is the focus of the camera. Since the perpetrator was caught at the same distance $z_r$ we have $$\frac{h_{r1}}{h_{i1}} = \frac{z_r}{f} = \frac{h_{r2}}{h_{i2}} = \text{a constant}$$ where 1 and 2 refer to the two people in your question. You can easily solve it from here to get $h_{r2} = 4.625$ ft.