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You appear to be referring to the fact that if a/b = c/d then ad = bc.
You know this is true because of the axioms of equality (If you do the same thing to both sides of an equation, then equality is maintained).
a/b = c/d
multiply by d
ad/b = c
multiply by b
ad = bc
If you wish to prove a specific proportion is true, you can test it with the equation ad = bc
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Multiply the cross products, and see if they are equal. If they are equal, the proportion is true. If they are unequal, the proportion is false.
What is true about the cross products of a proportion?
They're equal
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A ratio is simply a comparison between 2 numbers. Example- 4:3 A proportion is 2 fractions equal to each other or "proportionate".
How can you tell if a proportion is false?
Multiply the cross products, and see if they are equal. If they are equal, the proportion is true. If they are unequal, the proportion is false.
How can you tell if a proportion is true?
If you cross-multiply and you obtain an equality, then the proportion is true. Example: 2/3 = 20/30 ? cross-multiply; 2 x 30 = 3 x 20 ? 60 = 60 Since we have an equality, the proportion is true.
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What is a true proportion?
A true proportion is when two ratios are equal to one another. To prove this, you need to find the cross products of the ratios and see if they are equal. An example of a true proportion are the ratios 1/2 and 5/10, if you take the cross product the result is 2 x 5 = 1 x 10, which are equal.
What is difference between proportion and probability?
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Inbreeding decreases the proportion of homozygotes in a population?
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The expected frequency is determined by multiplying the sample size by the hypothesized proportion?
True.
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true
