The hypotenuse of a triangle was 19 cm and the hypotenuse of the final triangle was 4.75 cm. What is the scale factor?

The scale factor is calculated by dividing the length of the new hypotenuse by the length of the original hypotenuse:

Scale factor = new hypotenuse length / original hypotenuse length
Scale factor = 4.75 cm / 19 cm
Scale factor = 0.25

Therefore, the scale factor is 0.25.