[c0riander]

You would generally want to "change the ratio" of something if you felt there was untapped potential or interest that wasn't being expressed, often due to some systematic or structural barrier.

As an example, I can tell you, I go to a lot of startup events and they are often centered around activities like ping pong or beer drinking. I know many women interested in entrepreneurship and try to get them to go with me, but they tell me they don't like ping pong or would feel uncomfortable. And, at the events themselves, there are typically only one or two women who actually came.

Changing the ratio would involve creating an atmosphere that would encourage women who already have an interest to act on it and thus be better represented.