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There is no single ideal ratio.
For an ideal transformer, the voltage ratio is the same as its turns ratio.
The common mode rejection ratio of an ideal amplifier is infinity.
A quick ratio of 1 is regarded as ideal and demonstrates good liquidity within the business
Quick ratio means
There are different ideal ratios for different situations. For example, the ideal ratio of hydrogen to oxygen atoms, in water, is 2:1. The ideal ration for sodium and chlorine atoms for salt is 1:1.
The ideal motorbike to rider weight ratio is 0.07. The closer the ratio is to zero, the more it feels like one is riding without the motorbike weight, just the rider's.
The ideal current ratio for banks 1.33 : 1
It is considered that a shape, eg. Rectangle, with the golden ratio looks "most pleasing to the eye".
The golden ratio is the ideal ratio because it is consistent throughout many aspects in nature - proportions of the human body, the crests and troughs of a heartbeat, the stripes on a tiger's head, et cetera. The value of the Golden Ratio is 0.5*[1 + sqrt(5)] = 1.61803 (to 5 dp)
1:10000
Ideal mechanical advantage is a numerical ratio. It's a naked number without a unit.