Are you saying that if I lift both wheels off the ground and spin the drive shaft the wheels will turn 1 revolution for every 4.11 turns of the driveshaft.
Unless you have a locking differential you can't count on that. If you have a locking diff that is exactly what would happen.
Because of the way the differential works most approaches to counting revolutions have one tire securely on the ground and require a little math to determine the ratio.
