Answer:

3.) b

4.) c

Step-by-step explanation:

3.) a. 3 : 5 = 4 : 6

5 and 4 are means; 4 and 6 are extremes

5 × 4 = 20 ; 6 × 3 = 18

Answer: 20 = 18 is Not Proportion

b. 12 : 8 = 36 : 24

36 and 8 are means; 24 and 12 are extremes

36 × 8 = 288; 24 × 12 = 288

Answer: 288 = 288 is Proportion

c. 5 : 9 = 9 : 5

9 and 9 are means; 5 and 5 are extremes

9 × 9 = 81 ; 5 × 5 = 25

Answer: 81 = 25 is Not Proportion

d. 81 : 18 = 12 : 21

18 and 12 are means; 81 and 21 are extremes

18 × 12 = 216 ; 81 × 21 = 1701

Answer: 12 = 1701 is Not Proportion

4.) 5 : 8 = 30 : n

30 and 8 are means; 5 is extremes; n = ?

30 x 8 = 240 ÷ 5 = 48

Answer: c. 48

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