Silveras said:Your Eldritch Knight would conceivably get nothing for the Ranger level, then the 5th level Wizard ability. Thereafter, he might get either the 10th level Wizard and the 15th level Fighter ability, or vice versa, as the EK is a Fighter/Arcanist sort of hybrid class. Although you can qualify by being a Ranger instead of a Fighter, I think you would need to pursue a more woodsy-oriented PrC to get the Ranger abilities.
How I think I'd handle it is that I'd just let the PC's stack their prestige class levels with their base levels as they'd see fit... so, for instance, a Ranger1/Wizard5/Eldrich Knight5 could have not only the 5th level Wizard ability, but could have either the 5th level Ranger ability or the 10th level Wizard ability, or split his levels quasi-evenly and have neither. But that's just a matter of taste, it seems to flow better that way.