Wimbledon has had equal prizes for both men and women for quite a few years now. The combined total this year was £25 million. That is a lot of money. However, there are many other less popular competitions during the tournament that get very little prize money when compared.
en.wikipedia.org/wiki/2014_Wimbledon_Championships#Prize_money
The reason that happens is because they are far less popular. But at the same time , the ladies' single competition is also far less popular than the gentlemen's. The popularity, tv ratings are far higher for men and so are the ticket prices. So my proposal is this : separate every tiny bit of income each competition brings ( anything from tickets, tv rights, sponsors to strawberries and Evian bottles) then pay the prizes accordingly .
Sport is an industry based on performance and popularity. If you were working in sales and did 5 times better than the person sitting next to you, getting the same bonus at the end of the year wouldn't be very fun, would it?