在数学中ratio和proportion有什么区别？

在数学中ratio和proportion有什么区别？

帮你google了下，下面是英文的注解：
A ratio is a comparison of two numbers. We generally separate the two numbers in the ratio with a colon (:). Suppose we want to write the ratio of 8 and 12.
We can write this as 8:12 or as a fraction 8/12, and we say the ratio is eight to twelve.

Example:

Jeannine has a bag with 3 videocassettes, 4 marbles, 7 books, and 1 orange.

Proportion:

A proportion is an equation with a ratio on each side. It is a statement that two ratios are equal.
3/4 = 6/8 is an example of a proportion.

When one of the four numbers in a proportion is unknown, cross products may be used to find the unknown number. This is called solving the proportion. Question marks or letters are frequently used in place of the unknown number.

Example:

Solve for n: 1/2 = n/4.
Using cross products we see that 2 × n = 1 × 4 =4, so 2 × n = 4. Dividing both sides by 2, n = 4 ÷ 2 so that n = 2.

意思大概为，ratio是指两个数的比值，并且有冒号或以分式的形式约束。比如8：12或8/12，这是比率，即ratio。
而proportion是指一个等式，并且在等号的两边有相同比例的述。如8/12=2/3。

祝学习进步~