Why wedding ring should be put on the fourth finger?

Thumb represents           = Parents
Second finger represents = Brothers & sisters
Center finger represents  = Own self
Fourth finger represents   = Your Partner/Spouse
Last finger represents       =  Your children

Really interesting

Why wedding ring should be put on the fourth finger??
Pls read the following, you may not believe that really god made this a miracle (this is from a Chinese excerpt) but still interesting!

Firstly, join your palms as shown in photo below, center finger bend and put together back to back
Secondly, let the rest of the 4 fingers touch tips to tip
Game begins, follow the instructions below for all the 5 fingers but only 1 pair can split.  



Try to open your thumb, the thumb represents parents, it can be opened because ..... ............ Whoever may be, our parents will leave us one day.
Please close up your thumb, Then open your second finger, this finger represents brothers and sisters, they do have their own family which is the reason that they will leave us too. Now close up your second finger,
Open up your little finger, this represents your children. Sooner or later they too will leave us for they got they own living to live nevertheless, close up your little finger,
Try to open your fourth finger in which we put our wedding ring; you will be surprised to find that it cannot be opened at all. Because it represents husband and wife,  this whole life you will be attached to each other
Real love will stick together ever and forever.