Increase quality back links for PR

Hello Dear,
you r saying that your site pr is #3 but its meaning is that your site at the position 3 in SERP.
Please clear your question.

If this #3 is your site pr than you can increase back link quantity to the related site only, your site page rank will be increased. your site content should be user friendly.

Hi,
PR can be increased by adding relevant content on that page which attracts search engines and also quality back links.

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submitting to the related sites and related links will get you more backlinks .and also in forum posting with your SIG...

Update your website every day by adding more unique content. If you site has some information for a visitor then it is 100% chance for him to come back to your site again. Provide inside linking to your website. For example you can provide a link of your previous and next articles on an article page. Or you can provide a list of related articles so visitor can remains a long time on your website. .best of luck!

submit it to the related link and site

Increase BackLinks from relevant and related websites. Through Directory Submission, Commenting on others blogs, Link Exchange, Participate in Forums (Use your site link with a nice anchor text on the signatures of Forums), etc…