How was ratio discovered and how do use use it in your average day?

Question: How was ratio discovered and how do use use it in your average day?
- Keywords:
  ratio
Asked by zaracox on 22 Jan 2020.
- Fiona Macfarlane answered on 22 Jan 2020:
  
  I am not sure if we will know hot the ratio was first discovered, but it was definitely being used in Ancient Greek times by Philsophers like Pythagoras.
  
  In my work I use ratios to consider things like probability, for example if you did something 100 times how many times would the event happen. We then use this ratio in calculations.
  
  In my day to day life ratios are used all the time, e.g. how much fuel I have left in the car and in cooking (for example splitting up big batches of cooking into meals)

Question: How was ratio discovered and how do use use it in your average day?