To achieve the higher PR, you have to concentrate on the Unique Content along with the quality backlinks.
PageRank - is a measure of the number and quality of the links that point to a given page. SO build more links to your site To increase Page Rank .
Got Backlinks from relevant and god PR sites. PageRank is a link analysis algorithm, named after Larry Page[1] and used by the Google Internet search engine, that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the World Wide Web, with the purpose of "measuring" its relative importance within the set. The algorithm may be applied to any collection of entities with reciprocal quotations and references. The numerical weight that it assigns to any given element E is referred to as the PageRank of E and denoted by PR(E). This is 0.75.
Simple. Just also get a HIGH PAGE RANK Link from other site with very low outbound links. And, you'll surely achieve a high page rank too.
Higher PR = Quality back links + higher visitors + lower linking/crawl errors Doing white hat seo and submitting to most relevant site is also a big help.