Question

Check whether 10 20,30,and 40 are in proportion or not

Answer 1

t2-t1=20-10=10 t3-t2=30-20=10. t4-t3=40-30=10 therefore it is in proportion

Answer 2

I think that this can be expressed in ratio as following

1:2:3:4

Check

10+20+30+40 is equal to 100

Now, let the ratio be x

1x+2x+3x+4x is equal to 100
10x is equal to 100
x is equal to 100/10
x is equal to 10

So, values are
1x is equal to 10
2x is rqual to 20
3x is equal to 30
4x is equal to 40


HENCE CHECKED