If you have two items using different units of measurement, you must first convert to the same type in to percentage. Then, you can compare the ratio,
It is called coefficient of variability. For example if you want to compare length with weight of two variables or populations, then first convert the measurements in percentage and then go for comparision.
It is the scale ratio or scale factor
The ratio for a diagram measurement to the actual measurement is known as the key.
scale
A ratio between two sets of measurements is called a proportion. A proportion is a statement that two ratios are equal. It is often used to compare quantities or values in different contexts, such as in mathematics, science, and finance. The relationship between the two sets of measurements can be expressed using fractions or decimals.
A ratio tells the relationship of two measurements that stays the same even as the measurements increase or decrease. 1 yard is about 0.000568 miles. The ratio is thus 1/0.000568.
The name for the ratio of a diagram measurement to actual measurements is the scale.
rate
It is the conversion factor between the measurement units.
Usually such ratios have a specific name. For example, the ratio of a mass measurement (g) over a volume measurement (mL) is called density. The result is a number with the unit g/mL. Most cases that have different units will have a specific name if they're commonly used. Other examples include molarity, molality, joules, newtons, and ppm.
Rate
Time
If the two measurements are of the same type, such as length, we could use that ratio to convert from one measurements to another. An example is the ratio of 1.609 Km to 1 mile. Here, we can multiply some number of miles by 1.609 and find the kilometer distance. If the two measurements are of different types, that is often used as a definition of another quantity such as speed. Speed is defined as the ratio of the distance traveled to the amount of time it takes. These two examples are the most common uses when taking the ratio of two measurements, yet there may be a more generalized term or theorem here, but I've not heard of it yet.
conversion factor
It is a ratio scale of measurement.
None. There are some measurements which, in some people, are approximately equal to the Golden Ratio but those same measurements, for other people, are not.
Ration does not have units. You have to convert one of them to the same units and then work it out. For example: what is the ratio of 4m to 200cm ? This is the same as: 4m to 2m - so the answer is 2 to 1. (400cm to 200cm gives the same answer.)
It is the scale ratio or scale factor