Convert 3D Polylines from meters to feet

[KateDoughty1]

I have numerous 3D polylines showing various altitude heights from start to end of each polyline. The program they're exported from assumes the altitude values are in meters, so they're multiplied by 3.28084. Is there a way to convert the altitude (z) of the polylines back to feet (IE divide by 3.28084)?

[KateDoughty1]

I wonder if Adjust Z 3D only works if the polyline is at a constant Z value (not varying altitudes as we have) - just a thought. Good luck!