https://virtualnerd.com/geometry/similarity/ratios-proportions/means-extremes-definition

Note: A proportion is just an equation where two ratios are equal, and each piece of the proportion has a special name. This tutorial will teach you those names, ...

Nov 1, 2009 ... Click here for the full version: http://vn2.me/epb A proportion is just an equation where two ratios are equal, and each piece of the proportion ...

https://mathcs.clarku.edu/~djoyce/java/elements/bookVI/defVI3.html

Definition 3. A straight line is said to have been cut in extreme and mean ratio when, as the whole line is to the greater segment, so is the greater to the less.

https://www.wyzant.com/resources/blogs/14833/means_and_extremes

Jan 26, 2011 ... The ratio (which is a rate in this case) 60 mi : 1 h is equivalent to the rate ... So, we can cross-multiply the means (1 × 120) and the extremes (60 ...

https://www.wyzant.com/resources/lessons/math/algebra/proportions

The proportion shown below compares two ratios which are in the fraction form. ... The illustration of the means and extremes is shown again for your reference.

http://www.math.com/school/subject1/lessons/S1U2L2DP.html

A proportion is simply a statement that two ratios are equal. It can be written in ... Here, 20 and 5 are the extremes, and 25 and 4 are the means. Since the cross ...

http://mathworld.wolfram.com/ExtremeandMeanRatio.html

Number Theory > Constants > Golden Ratio >. Extreme and Mean Ratio. SEE: Golden Ratio. Wolfram Web Resources. Mathematica ». The #1 tool for creating ...