If $$\frac{a}{b} = \frac{c}{d}$$ , what is the cross-multiplication equation?

The cross-multiplication equation is $$a \times d = b \times c$$ .

What does it mean if two ratios are equivalent?

If two ratios are equivalent, they represent the same relationship between quantities.

How can proportions be used in real life?

Proportions can be used in real life for scaling recipes, calculating distances, and converting measurements.

What is a direct variation?

Direct variation is a relationship between two variables where one variable is a constant multiple of the other.

If y varies directly with x, what is the equation?

The equation is y = kx, where k is the constant of variation.

What is the constant of proportionality?

The constant of proportionality is the constant factor that relates two proportional quantities.

How do you determine if two ratios form a proportion?

Two ratios form a proportion if their cross products are equal.

What is an example of a proportion in a word problem?

If 3 apples cost $1.50, how much do 5 apples cost? This can be set up as a proportion.

Proportions Flashcards

Student preview

15 questions

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1.

FLASHCARD QUESTION

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

2.

FLASHCARD QUESTION

Front

How do you solve for x in a proportion?

Back

To solve for x in a proportion, cross-multiply the terms and then isolate x.

3.

FLASHCARD QUESTION

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

4.

FLASHCARD QUESTION

Front

Back

5.

FLASHCARD QUESTION

Front

Back

x = 75.

6.

FLASHCARD QUESTION

Front

Back

x = 77.

7.

FLASHCARD QUESTION

Front

Back

x = 16.

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