Changing the content of .bash_profile (the PATH part in your case) will not do the trick.
As a general rule you do not want to give normal users root privileges, but there are cases that a normal user wants to execute one (or a few) "root commands". To make this possible the sudo
command was implemented.
Here's a general description of the sudo command: Sudo - Wikipedia
These links will help you set things up and show some examples:
Sudo Setup Guide - linuxhelp
Using sudo - LHN
There are a lot of articles to be found on-line about this topic, so do use your favorite search engine for more information. You don't mention your linux distro, I'm guessing there is one specific for that one, so do include your distro in the search.
Hope this helps.