anonymous
  • anonymous
Which pair of ratios forms a proportion?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
\[\frac{ 10 }{ 22 } and \frac{ 5 }{ 44 } , \frac{ 16 }{ 9 } and \frac{ 8 }{ 18 } , \frac{ 7 }{ 8 } and \frac{ 14 }{ 16 } , or \frac{ 20 }{ 24 } and \frac{ 40 }{ 12 }\]
zepdrix
  • zepdrix
For pairs to be proportional, we should be able to multiply one of the pairs by \(\Large 1\) and end up with the other. We'll multiply by \(\Large 1\) in a sneaky way though.\[\Large \frac{2}{2}=1\] So if we take the first pair, let's try the multiplication and see what happens.\[\Large \frac{2}{2}\cdot\frac{5}{44} \quad=\quad \frac{10}{88}\]Hmm that pair doesn't work. See how we weren't able to produce 10/22 by multiplying by 1?
zepdrix
  • zepdrix
Try the next pairs, what do you get?\[\Large \frac{2}{2}\cdot\frac{8}{18} \quad=\quad ?\]

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anonymous
  • anonymous
4/9
anonymous
  • anonymous
Evaluate them so you get them in decimal form. The decimals should be = like 1/2=.5 in decimal just plug it in. 1/4=.25 ---
zepdrix
  • zepdrix
Yah that's a better idea actually :) Cause I know you'd rather shortcut through these, so that's probably a nice easy way to approach it.
anonymous
  • anonymous
i'll do first one for you 10/22 = 5/44 .45454545454=.113636363 so no
anonymous
  • anonymous
ok is it the 3rd option
anonymous
  • anonymous
7/8=14/16 .875=0.875 YES :D
anonymous
  • anonymous
Yeah some people like factoring to do these. WHich sucks.

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