for example ''Mrs. Stearns need to photocopy a 9.5 cm wide by 16 cm long picture. She wants to enlarge the picture so its length is 40 cm. How wide will the picture be?'' i need help on these kind of problems i will be getting a tutor soon so watch out. and please help me online with my homework because i might get kicked out of my upper level [above grade level] math class so please help me! i greatly appreciate all your help!!!
how to set up proportions?
I would set up the problem so that the current dimensions become fractions:
9.5 cm wide/16 cm long; or 9.5/16
Compare that to the desired dimensions of:
x (unknown)/ 40 cm long; or x/40
Then Cross Multiply:
40 * (times) 9.5 = you got this!
16 * (times) x (or the unknown number)= 16x
The last step is to divide the two products:
you got this/16x
What you get is the unknown, or x. That's how wide it would be!