A proportion is really two ratios that are equivalent to each other. Here is an example: There are several ways to tell if two ratios form a proportion.
1st method: Check to see if the same scale factor was used on top and bottom.
2nd method: Try and simplify one or both of the ratios. In this example, we could reduce the second ratio. Check it out: Once again, we can see that the two ratios are equivalent. Therefore, they must form a proportion.
3rd method: Cross products: Multiply the numbers that are diagonal to each other. If the products are equal, the two ratios form a proportion. 5 x 28 = 140 7 x 20 = 140 Check out what happens when you do not have a proportion: 2 x 45 = 90 3 x 28 = 84 Here, the cross products are not the same. This shows that the two ratios are not a proportion. These steps are also useful in finding the missing number in a proportion.
Illustration: Here are some examples of finding the missing number in a proportion using all three methods.
1.)
If then the value of x is equal to | |||
Right Option : B | |||
View Explanation |
Which of the following are in proportion? | |||
Right Option : B | |||
View Explanation |
Determine if the following are in proportion : 12, 144, 25, 625 | |||
Right Option : B | |||
View Explanation |
One of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
It was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
It was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Being a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
My experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
It has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
My experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.