Graphical: If two variables are proportional, the graph of one of the variables against the other is a straight line through the origin.
Algebraic: If the ratio of the two variables is a constant.
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it is a proportional relationship because a proportional relationship is known as a relationship between two quantities in which the ratio of one quantity to the other quantity is constant.
A ratio is a proportional relationship between two numbers or quantities. An example sentence would be: The ratio of water to land is astounding.
If the ratio between each pair of values is the same then the relationship is proportional. If even one of the ratios is different then it is not proportional.
A ratio shows the relationship between two quantities.Formula
A proportional relationship is of the form y = kx where k is a constant. This can be rearranged to give: y = kx → k = y/x If the relationship in a table between to variables is a proportional one, then divide the elements of one column by the corresponding elements of the other column; if the result of each division is the same value, then the data is in a proportional relationship. If the data in the table is measured data, then the data is likely to be rounded, so the divisions also need to be rounded (to the appropriate degree).