Final answer:
The length of the model boat is 14 cm.
Step-by-step explanation:
To find the length of the model boat, we need to use the scale factor. The scale of the model boat is 1 cm to 4.5 meters, which can be written as 1 cm : 4.5 m. The real boat is 63 meters. We can set up a proportion to find the length of the model boat: (1 cm / 4.5 m) = (x cm / 63 m).
Cross-multiplying, we get x cm = (1 cm / 4.5 m) * 63 m = 14 cm.
Therefore, the length of the model boat is 14 cm.