is there any ratio of inbound links to out bound links?

hmmmm do you mean what is a preferred ratio for inbound and outbound links? I will guess that is your question as we get that exact question alot from our own clients.

Lets say you have 100 outbound links and all 100 of those links are reciprocal linking back to your site. Although there is no proof of this, it's possible some search engines won't give you full credit for all 100 links if they are all reciprocating, ie a 100% RLR (reciprocal link ratio).

I tell our clients to link out to sites that benefit the end user regardless of reciprocation. However of course it's beneficial to get some links to reciprocate. Therefore, any RLR between 20 and 60% is optimal. I say 20-60 because it looks good to have outbound links that don't reciprocate. This shows the search engines you are linking for the end user and not necessarily for the search engines.

One could argue that a 100% RLR for a low number of links over a long period of time is perfectly acceptable. I would tend to agree with that. But looking at short term such as a link building campaign over a 3 month period whereas you would link out to say 50-100 sites in hopes that some will link back, a RLR in the ballpark of 20-60% is typical and should not considered to be bad.

Try not to over-analyze RLR percentages and that kind of thing. Link and be linked to (when it benefits your end users). As long as your linking benefits the end user and is not from or to irrelevant sites in high volume, you should do just fine regardless of your RLR.