> Well, cross multiply is the key. Change these given ratios as a fraction then cross multiply and last, check if their products are the same. If the products are the same, the ratios are automatically proportions.
Example:
Are 2:3 and 8:12 proportions?
> Yes.
Why?
Chech my solution below.
- We can see that the products are the same so, the given ratios are proportions!
You don't have to change the given ratios as a fraction, it's up to you if you're going to change it as a fraction but in my opinion, it's much more better to change it as a fraction first so that you can cross multiply them easily.
HowtoKnowIftheGivenFractionsAreProportions?
> Again, we have to cross multiply the given fractions and check if their products are the same.
Example:
Are and ?
> Yes.
Why?
Check the given solution below.
- The cross products are the same so, the given fractions are proportions!
If you find any mistakes with my answer, just comment here in my answer and I'll reply to your comment. Also, if you have any questions, please ask nicely and comment your other questions here in my answer. Thank you!
Answers & Comments
How to Know If the Given Ratios Are Proportions?
> Well, cross multiply is the key. Change these given ratios as a fraction then cross multiply and last, check if their products are the same. If the products are the same, the ratios are automatically proportions.
Example:
Are 2:3 and 8:12 proportions?
> Yes.
Why?
Chech my solution below.
- We can see that the products are the same so, the given ratios are proportions!
You don't have to change the given ratios as a fraction, it's up to you if you're going to change it as a fraction but in my opinion, it's much more better to change it as a fraction first so that you can cross multiply them easily.
How to Know If the Given Fractions Are Proportions?
> Again, we have to cross multiply the given fractions and check if their products are the same.
Example:
Are
and
?
> Yes.
Why?
Check the given solution below.
- The cross products are the same so, the given fractions are proportions!
If you find any mistakes with my answer, just comment here in my answer and I'll reply to your comment. Also, if you have any questions, please ask nicely and comment your other questions here in my answer. Thank you!
#LearnMathWithBrainly
2. No
18 : 45 and 4 : 10
3. Yes
4. No
3 : 21 and 6 : 42
5. No
9 : 12 and 24 : 32