Mathematics - Chain Rule and Proportions

Direct Proportion  

- Two quantities are said to be in direct proportion if an increase in one results in an increase in the other.  

- In direct proportion, the ratio of the two measurable quantities remains constant.  

Inverse Proportion  

- Two quantities (a) and (b) are said to be in inverse proportion if an increase in one results in a decrease in the other.  

- This happens in such a way that the product of their corresponding values remains constant.