the former formula of PR is about backlink to the site, but i think google change the algorithm a bit. But, in general, PR is determined by the backlink to it. Get quality backlink will boost your PR
I agree with what 'GuruCreation' had said but dont expect to get a PR5 overnight, it took me 4 years to get a PR5 for my site!
Just improve the structure of your site and collect the good link and then wait for your desired PR , time frame is unpredictable..it depends on the Google
Quality submissions you gets high PR, contents is unique and design is also good for to increase High PR.
Very true.. and for quality back link generate links from High PR and good Quality contents sites.. Do: SMO, Articles, Forums, Commenting, Blogs, Directory Submission..
You shouldn't be too concerned over your site's PR. You should instead be concerned about generating traffic that makes you money.
by improving number of quality back links from PR 4 5 sites, quality content, number of internal pages can also effect the page rank.
Find authority sites in your niche where you can leave your backlinks. In the mean time get as much traffic to your site. By that I mean unique visitors. This will help you establish your site as an authority site in Google eyes. Then your Pagerank will go up out of itself. Not only that but you will be on Google First Page.