Linked from
The 17 pages that link to Ratio, each with the reason it gives.
SlopeRelated: Slope is a signed ratio of changes in two coordinates.
Conversion of unitsRelated: The ratio of equivalent measurements supplies the conversion factor.
PercentageRelated: Percentages express a part-to-whole ratio on a scale of 100.
Intercept theoremRelated: The theorem equates ratios of segments on the two transversals.
Midpoint theoremRelated: The side-length conclusion states a ratio of one half.