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Maths Exercices

Do the ratios form a proportion?

A proportion is a statement that two ratios are equivalent to each other. Two ratios form a proportion if their cross products are equal.

Do these ratios form a proportion? and

Compare the two cross products. Multiply the numerator of one fraction and the denominator of the other.

5 × 15 
?
=
 3 ×25

75  =  75

The cross products are equal, so the ratios form a proportion.

Do these ratios form a proportion? 2 to 5 and 4 to 6

Write the ratios as fractions: and

Compare the two cross products. Multiply the numerator of one fraction and the denominator of the other.

2×6 
?
=
 5 × 4

12   20

The cross products are not equal, so the ratios do not form a proportion.