a good way to determine if your hands are proportional is to measure on the back of your hand from wrist to first middle knuckle (the knuckles on the back of your hand, before your fingers start), and then from the first middle knuckle to the tip of the middle finger. these lengths should be about the same.
My fingers are really long, but skinny as hell...I wear a size 4.5 ring, and I'm just under 5'10. I also have tiny palms, and noticeably curved pinky fingers.
_________________ 'I refuse to have a battle of wits with an unarmed man' -Oscar Wilde