A ratio chart is something most commonly used to track stocks or to plot statistics. These are known to be very confusing and hard to use.
flow chart
A pie chart only shows up to 100%, divided into portions.
12 is a single number. In so far as it can represent a ratio, it is a ratio of 12 to 1: a unit ratio.12 is a single number. In so far as it can represent a ratio, it is a ratio of 12 to 1: a unit ratio.12 is a single number. In so far as it can represent a ratio, it is a ratio of 12 to 1: a unit ratio.12 is a single number. In so far as it can represent a ratio, it is a ratio of 12 to 1: a unit ratio.
A pie chart or a stacked bar chart.
Exploded Pie Chart