I have a simple mesh and I have extruded the edges and want to scale little outside with all edges proportionally. I have applied scale and rotation and removed doubles. I have tried Alt+S and changed the pivot to Individual Origins but nothing seems to work. What else can I do to make my mesh have an equal or proportional scale?
Alt+S command should do the job here. Don't know why it doesn't? What you can do is extrude the bottom edge loop downwards (E,Z), select the extruded face loop, press E,RMB, then Alt+S, S (to enable even thickness mode). Finally delete the unnecessary geometry.
The edges are scaling proportionally, they are just of different lengths. For instance if the long edge is 6 units and the short edges are 2 units, when they are scaled by a factor of 1.5, the delta length of the long edge will be 3 units while the short edges will only be 1.
This might help you, though, (if I understand you correctly) in keeping the edges forward, even though the scaling remains the same. I'm just adjusting the pivot point and using 3D cursor as the pivot: