There are no exact proportions in tzedaka and you can/should follow your heart. But there are certain guidelines indeed.
R Hershel Schachter brings the following (from an interview in Jewish Action here)
The question is what does “precedence” mean? Does it mean you give
everything to the poor people in your family? The commentaries assume
that this is not the case. The Chatam Sofer (II: 233-234) writes that
you give half of your tzedakah money to family and divide the other
half among other poor people.
He mentions other poskim adjust the split of the tzedaka budget going to those with precedence: Aruch Hashulchan: 51%, Chochmat Adam and R Moshe Feinstein 67%, Pitchei Tshuva 75%.
Here is an example following [the 67% opinion]: Assuming I have $1,000
to give to tzedakah, if I have a relative who needs $667, I give it to
him. The maximum is $667; but if he needs less, I give him less. Once
my relatives are taken care of within the amount of $667, I give up to
two-thirds of the remaining money to needy neighbors. And of the
remaining money, I similarly give up to two-thirds to aniyei ircha.
And so on, through the list of priorities.
For more sources and details on priorities, see here.