Ratio and proportion

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Faye

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I have no idea what the other two answers are? If someone could explain. Thank you.

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I think what I would do here is observe that:

[MATH]\frac{a}{b}=\frac{c}{d}\implies ad=bc[/MATH]
And now check to see which of the given equations also imply this same thing. I only see one choice besides a) that works.
 
MarkFL said:
I think what I would do here is observe that:

[MATH]\frac{a}{b}=\frac{c}{d}\implies ad=bc[/MATH]
And now check to see which of the given equations also imply this same thing. I only see one choice besides a) that works.
Click to expand...
Yes, I know ad=bc, but how would you flip that to a different fraction/proportion.
 
Faye said:
Yes, I know ad=bc, but how would you flip that to a different fraction/proportion.
Click to expand...

I wouldn't try to manipulate \(ad=bc\), but simply see which of the given equations also imply this same thing.
 
MarkFL said:
I wouldn't try to manipulate \(ad=bc\), but simply see which of the given equations also imply this same thing.
Click to expand...
Is there a way to do this without substituting to see what the answer is. For example, I did a proportion that I know was correct:1/2 = 2/4. And I would say the answer is c.
 
Faye said:
Is there a way to do this without substituting to see what the answer is. For example, I did a proportion that I know was correct:1/2 = 2/4. And I would say the answer is c.
Click to expand...
I came up with the answer as the first and third one. I hope I did that correctly.
 
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