The best replacement for proportion is percentage.

The best alternatives to proportion are rated as following:
★★★★★  percentage
★★★★★  ratio
★★★  portion
★★  percent
★★  scale
★★  probability
★  rate
★  mean
★  composition
★  variation
★  fraction
  inverse proportion
  constant composition
  indirect proportion
  population proportion
  inverse
  golden ratio
  prevalence
  phi
  definite composition
  percent equation
  odds
  direct proportion
  incidence rate

Your alternative for proportion is not listed? Suggest!
Speaking about proportion, one probably shouldn't forget about z scores.

Other search terms related to proportion and their ratings are:
★★★★★ z scores
★ missing value
You have in mind a companion for proportion and it is not yet here? Propose!



Google Trends

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proportion
percentage
ratio