Generally, Google Page Rank is based on inbound links, therefore, the more backlinks you congregate higher your page rank will be. Also, it is influenced by rank of a page which is linked to you. One other thing to consider is that the older your website will be, it will be more favorable and trusted by Google. Google rewards those websites who incorporate lots of pages, tons of incoming link and also healthy quantity of internal links to other pages within the site. In respect of SEO projects, it is relatively not so significant but delivers a picture about work to perform towards earning inbound links.