How do you find the ratieo of and arm spand?

To find the ratio of an arm span, measure the distance from fingertip to fingertip when both arms are fully extended. This measurement is typically equal to a person's height, so you can compare arm span to height to find the ratio. For example, if a person's arm span is 70 inches and their height is 68 inches, the ratio would be calculated as 70:68, which simplifies to 35:34.