If your link was the ONLY link on the page, then probably. There's also a damping factor involved. It works out so that only about 85% of a page's PR is actually passed along to the pages it links to.
Again, though, you'd have to be the ONLY link on the page to get the full benefit of that page's power.
The best way to figure out what kind of work it's going to take to get from PRwhatever to PRwhatever+1 is to take all of your current backlinks and know that you'll have to (roughly, since you don't know exactly where you are within the fraction of the current PR you have) multiply that work by 4. So, if you've got a PR5 and have 250 links, you'd need 1000 links of roughly the same quality and quantity to get to PR6.
Then again, if you've focused on only high power links and now your numbers of existing high power sites that can link to you are diminished, it'll be harder to keep up the pace of getting the same quality of links and that 1000 is sure to go up. This is why I always suggest that people don't worry about PR when trying to get an inbound link - just get the damned link, already. Then move onto the next one.
Every link counts, so just go get 'em. It takes more time to decide whether to "bother" getting a link than it does to ask for it and get it.
G.
Greatly appreciated!
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