Wow! I think something's wrong. Road bikes with ~73° head tube angle and 700c rims typically have fork rakes between about 40mm and 45mm for a trail of around 60mm. Track bike forks typically have even less rake.

74mm of rake would result in a trail of only 26mm (given the same head tube angle angle and wheel diameter). Handling would be very twitchy with that much rake and very low trail.


Could you have left out the last step where you divide the difference of the two measurements by 2?