82.1k views
1 vote
(PLEASE HELP 100 POINTS)

Which pair of ratios form a proportion?

5 : 11 and 6 : 12

7 : 13 and 21 : 39

8 : 14 and 24 : 30

10 : 20 and 20 : 30

2 Answers

2 votes

Answer:

7/13 and 21/39

Cross multiply.

7 * 39 = 13 * 21

273 = 273

This is TRUE, so this forms a proportion.

Explanation:

User Tony Vu
by
7.3k points
1 vote

5/11 and 6/12

  • Cross multiply.
  • 5 * 12 = 11 * 6
  • 60 = 66
  • This is UNTRUE, so this does not form a proportion.

7/13 and 21/39

  • Cross multiply.
  • 7 * 39 = 13 * 21
  • 273 = 273
  • This is TRUE, so this forms a proportion. Let's keep going to make sure that this is our answer.

8/14 and 24/30

  • Cross multiply.
  • 8 * 30 = 14 * 24
  • 240 = 336
  • This is UNTRUE, so this does not form a proportion.

10/20 and 20/30

  • Cross multiply.
  • 10 * 30 = 20 * 20
  • 300 = 400
  • This is UNTRUE, so this does not form a proportion.

Your answer is 7 : 13 and 21 : 39 are a pair of ratios that form a proportion.

User Gonczor
by
8.3k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories