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Sex ratio denotes the ratio of males to females in a population. The primary sex ratio is the ratio at the time of conception, secondary sex ratio is the ratio at time of birth, and tertiary sex ratio is the ratio of adult human beings. According to CIA estimates the current world sex ratio at birth is 107 boys to 100 girls. In 2010 the global sex ratio was 986 females to 1000 males, which got further reduced to 984 females to 1000 males in 2011.
As for example 15 and 9 can be reduced to a ratio of 5 and 3
Golden ratio can be traced back to as early as 2500 BC. The Great Pyramid of Giza is an example of the golden ratio. the side is 612.01. and the half of the base is 377.9. 612.01/ 377.9= 1.61950... its approximately the measurement of the golden ratio. Another example is the Parthenon.
Ratio between two numbers is actually is the comparison between them. It is an example sentence for ratio.
There is no such thing as the ratio of a number. You need two numbers to calculate a ratio. A ratio is the same as a quotient. For example, the ratio of 4 to 2 is the same as 4 divided by 2.