## bakonloverk 2 years ago can some one plz explain how 2 solve proportion plz?

1. AriPotta

can you tell me the question you're on? and i'll explain while we work it out :)

2. bakonloverk

well i dont have a question tht uses proportions yet but i just need 2 know how 2 solve them

3. AriPotta

you should be using cross multiplication to solve them

4. bakonloverk

example plz

5. AriPotta

lol i need an example problem

6. bakonloverk

here hold on

7. AriPotta

mmk

8. bakonloverk

Hadria bought a storage trunk to place at the end of her bed that has a volume of 4.5 cubic feet. What is the volume of the storage trunk in cubic inches?

9. bakonloverk

thts the problem im on

10. AriPotta

4.5ft x (12in/1ft)

11. AriPotta

basically just multiply 4.5 and 12

12. bakonloverk

54

13. AriPotta

yep. so 54 cubic inches

14. bakonloverk

omg thank you so much

15. AriPotta

no problem :)

16. AriPotta

that wasn't cross multiplication btw

17. bakonloverk

oh ok

18. AriPotta

1ft = 12in. that's why i put 12in/1ft

19. bakonloverk

ohhhhhh

20. AriPotta

if you were trying to find how many feet it was, it would be 54in x (1ft/12in)

21. bakonloverk

ohhhh ok tht makes sense

22. AriPotta

there's a specif name for this kinda setup, i just forgot what it was lol

23. AriPotta

specific*

24. bakonloverk

wait it said tht 54 was wrong

25. AriPotta

wat

26. bakonloverk

the thing im using says tht 54 isnt the answer

27. AriPotta

it hsould be...

28. AriPotta

should*

29. bakonloverk

its either 648 7776 or 3888

30. AriPotta

oooh i set it up wrong. lawls.

31. bakonloverk

lol

32. AriPotta

4.5ft^3 x (12in/1ft)^3

33. AriPotta

so you have to cube 12 first, then multiply that by 4.5

34. bakonloverk

omg thts so many numbers

35. bakonloverk

so its 7776

36. AriPotta

wait

37. AriPotta

yea

38. bakonloverk

kk thank you

39. AriPotta

and the setup is called dimensional analysis. Dimensional Analysis: A problem-solving method used in physics, chemistry, engineering, and mathematics that is based on treating units in calculations as algebraic factors or fractions.

40. AriPotta

you should look it up, because it helps me loads :)

41. bakonloverk

ok thank you so much

42. AriPotta

no problem :)