I removed ios beta 4 profile from my device but still it is running on ios beta 4 version.

Removing the beta profile does not magically remove the installed iOS version.

As explained in the support document you posted from, you can either wait for a greater public release update to be available to update to, or you can restore the iPhone to factory condition through iTunes or Finder on a computer and it will install the non beta public release version available at the time.

Follow the rest of the steps in the support document you posted from to complete the removal.

You are correct. Removing the beta profile does not remove the beta iOS version that you have installed on your iPhone. Follow the instructions in this guide published by Apple ➔ How to uninstall iOS beta software - Apple Support

Axel F.