0.3d-1 / 3 1/3 = 0.84: 7/15

0.3

d

−

1

3.33

=

0.84

×

15

7

Further

0.3

d

−

1

=

12.6

×

3.33

7

0.3

d

−

1

=

42

7

0.3

d

−

1

=

6

0.3

d

=

6

+

1

0.3

d

=

7

d

=

7

0.3

d

=

23.33

or

d

=

23

1

3

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional