Question

show that 12:9,4:3 are in proportion
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Answer 1

Answer:

It can be written in two ways: as two equal fractions a/b = c/d; or using a colon, a:b = c:d. The following proportion is read as "twenty is to twenty-five as four is to five." In problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion

Answer 2

Answer:

12:9 , 4:3

(3×4=12) : (3×3=9) , 4:3

therefore, 4:3 , 4:3

-----> 12:9 , 4:3 are in proportion