I'm experiencing this right now in my current relationship. We're both in university, but my boyfriend is much more capable than me. He's been a part-time paralegal and a reservist infantry soldier for a while now, so he earns a lot of money (by university student standards). Meanwhile, I only recently started work in a single part-time job tutoring children after school. Not rolling in money, but just enough to get me by without extravagance.

We both recognise the disparity in our incomes. In the current stage of our relationship, whenever we go out together, he always insists on paying, usually for food, but sometimes also for entertainment etc. We were raised differently, so even though I always try to insist on paying my share of the expenses, he's a "traditional man" (who so happened to fall in love with another man) and so he believes he should pay for everything when we go out on dates. I appreciate and usually accept his offer. Consequently, I follow the "he provides, he decides" rule, so that whenever we go out, I'd let him decide where we'd go and what we'd do. I also usually try and return the favour in some other way, e.g. I'd invite him over to my house and I'd cook what I hope to be good food for him with my ingredients, or when there's a special occasion such as when he wins a rugby match I'd always buy him gifts that I know he'd find practical/useful. However, some might not see this as fair. At this stage of the relationship though, I put my foot down and never accept his money when it's for something that I alone use (unless he buys me a gift), nor do I ever ask him for money if he doesn't offer it.

We've been dating for many years now and we've agreed we'd move in together in the last year of university (which is fast approaching). When that happens, we've agreed that we'd open up a joint bank account, where we'd put in whatever money we can spare into the joint account (even if that means we put in unequal amounts), and we'd use the joint account to spend on anything that we share (e.g. rent, grocery shopping etc). He says he wouldn't mind "supporting" me with his money, and he treats it as an "income floor" for the relationship as a whole, rather than income redistribution, mainly because he's been raise to now believe it's his job to provide for the both of us. As we move forward in life it's most likely the case that I'll become the stay-at-home person so my contribution to the relationship's income would decrease in the future as I take up more housework and cooking and depend more on my boyfriend to provide for the both of us.

We're both happy with this future plan of attack, which is what I think is most important. Regardless of what ratio you split stuff at, as long as both of you in the relationship are content and happy, that should be fine. There is no magic formula applicable to everyone. A lot of things come into play here, such as attitude, personality, capability, willingness, and even culture and background, and the best thing to do is to sit down and talk and work it out between yourselves. That's what my boyfriend and I did one night when we were bored and started thinking about the near future :D