How do I convert outfield fence height to equal a greater distance?

I am trying to have college games played at our baseball facilities but the outfield fence is only 355ft in distance. I am trying to find out how much fence height equals field distance. (5 ft of fence height equals ? ft of field distance)
Update: This is done everyday by ballparks all over the place. Their has to be a formula to determine this. How else would they be able to mark the distance on outfield fences with varying heights? This is based on a straight line to the fence with a higher elevation.
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