Nesecito su ayuda por favor?

1)

a / 35 = 4 / 28

a = (4×35) / 28 = 5

a = 5

2)

22 / b = 66 / 45

b = (45×22) / 66 = 15

b = 15

3)

102 / d = 612 / 950

d = (102×950) / 612 = 96900 / 612

d = 24225 / 153

4)

205 / 170 = e / 680

e = (680×250) / 170 = 1000

e = 1000

5)

987 / 678 = g / 142

g = (142×987) / 678 = 70077 / 339

6)

99 / 45 = 88 / h

h = (88×45) / 99 = 3960 / 99 = 40

h = 40

7)

1234 / 5678 = 4321 / c

c = (4321×5678) / 1234

c = 12267319 / 617

8)

f / 78 = 405 / 612

f = (78×405) / 612 = 15795 / 306

Saludos.