# data[].attributes.body
A formula that represents two or more equal ratios. In proportion, the product of two external terms is equal to the product of two internal terms, which is called the fundamental property of proportion. The formula that represents two equal ratios is called proportion. In mathematics, if a change in one variable is always accompanied by another variable, then these two variables are proportional. If this change is always correlated through the use of a constant multiplier, then this constant is called a proportional coefficient or proportional constant. In proportion, the product of two external terms is equal to the product of two internal terms, which is the fundamental property of proportion. Solving an unknown term proportionally is called solving proportionally

# data[].attributes.body
speed：
In mathematics, speed represents how far an object moves per unit of time. It is usually expressed by the formula v = x/t, where v represents velocity, x represents displacement, and t represents time interval. Velocity can be positive, negative, or zero, indicating forward motion, backward motion, or rest, respectively.
ratio：
Ratio is a division formula or fraction consisting of one preceding term and one trailing term, which is another way of expressing them. Whereas a division expression expresses an operation, a ratio expresses a relationship between two numbers (for example, who is several times the other).
rate：
A ratio is the ratio between different categories of data in a sample (or population).