The reason you have less is because, on laptops that don't have a dedicated video card, the video card memory gets partitioned off from the RAM. Dedicated video cards on the other hand have their own memory/RAM cache, so they don't need to use your on board system RAM. Same thing holds true for desktops that have an on board video card... the memory to use that video card gets pulled from your on board RAM cards instead of a dedicated memory cache if you had an external video card connected to the motherboard.
So 1.25GB was dedicated for the video card to use, and the remaining 2.75GB was dedicated for the processor to use. You really wouldn't want to screw with that or you'll start experiencing poor performance from your video card as you take available RAM away from it.
The best thing to do is simply upgrade your ram if you can (get two 4GB cards instead of two 2GB cards) but 4GB is a decent amount. I have 1GB and my system runs fast as hell... but then again I'm a repair tech, so I know how to squeeze every drop of performance out of my 10 year old frankenstein'ish laptop. :)
I'm a slave at a big faceless laptop repair center