Proportional sequences have constant ratios called coefficient of proportionality. Inverse proportional sequences have constant products called coefficient of proportionality. Proportionality extends to related varying quantities called variables
Ratio is a comparison of two quantities using division (a:b). Proportion states that two ratios are equal (a/b = c/d). Ratios can be expressed as fractions (a/b) or written as a:b
Proportionality is denoted by '∝' symbol. Proportions show relationships between quantities. Proportions involve constant ratio of corresponding values
Proportion is a mathematical comparison between two numbers. Proportions are denoted using "::" or "=" symbols. Two ratios are equal when they are in proportion
Direct proportion shows one quantity increasing as the other increases. Indirect proportion shows one quantity increasing as the other decreases. Direct proportion uses y=kx, where k is the constant of proportionality. Indirect proportion uses y=k/x, where k is the constant of proportionality
Proportion is a relationship between variables linked by a constant. Direct proportion shows increasing values as one variable increases. Inverse proportion shows decreasing values as one variable increases. Proportional relationships are denoted by 'y \propto x' or 'y \propto 1/x'