How to create Rib on cylindrical part
i hope this helps
1.on the top first create a rectangle and make sure the rib which connects the cylinder, the portion of the sketch is concentric.i used project 3d elements and trimmed the excess.length is not important but width which is the thickness of the rib.
2.pad the profile
3.invoke a sketch on the surface slant height is important here rest not that much
5.final checks and voila.....