Here's Why ring held on the fourth finger. Do this test and I will obey.

A Chinese legend has managed to explain in a very convincing: The thumb represents parents. Index finger represents brothers, sisters and friends. Middle finger represents yourself.

Ring finger (the fourth finger) represents his / her spouse your. The little finger represents your children. Now join hands palm to palm, fingers join the middle so as to be directed toward yourself, as shown in the picture and join normally and the other fingers.

Now try to thumbs (parents) to remove from each other in parallel, you will notice that they separated fingers, because your parents are not destined to live with you until your death, join fingers again.
The same way and with the index fingers (brothers, sisters and friends) and you will notice that and they will be separated, because each of them go in search of their fortunes, join fingers again.

Now try to share the little fingers (kids) and you will notice that and they will be separated, because when kids grow up and are able to single out and then they leave, join fingers again.

Finally evidence to split ring fingers (fourth finger) will try to separate but will be surprised to note that you can not able to separate.

This is because the chance that a couple is destined to be together until the last day of their lives, and this is why rings held on the fourth finger.