Question

encuentra el termino en cada proporción
A) 3/4 = a/8
B) 5/a = 15/21
C) 2/12 = 12/a
D) 2/5 = a/20
E) 7/a = 28/21
f) 9/2 = - 54/a
g) 3/4 = X/2,2
H) 0,25/3 = 1,2/a
I) 1/3/2/15 = a/4/10
j) 3/7/a = 5/9/14

Answer 1

1.) a = (8x3)/4 = 6

2.) a = (5 x 21)/15 = 7

3.) a = (12 x12)/2 = 72

4.) a = (2 x 20)/5 = 8

5.) a = (7 x 21)/28 = 5.25

6.) a = (2 x -54)/9 = -12

7.) X = (2.2 x 3)/4 = 1.65

8.) a = (1.2 x 3)/0.25 = 14.4

9.) (1/3)/(2/15) = (15/(2x3)) = 15/6 = 5/2

a/4/10 = (a/4)/(10/1) = a/40 = a/40

5/2 = a/40===> a = (40x5)/2 = 100

10.) (3/7)/(a/1) = 3/7a; 

(5/9)/(14/1) = 5/126; 

3/7a = 5/126

a = (3x126)/35 = 10.8

Answer 2

A)3/4 = a/8
3*8=4a----- 24=4a ------a=24/4
a=6

B)5/a = 15/21
21*5=15a ------- 105=15a ------ a=105/15
a=7

C) 2/12 = 12/a 
2*a=12*12 ------ 2a=144 -------- a=144/2
a=72

D) 2/5 = a/20
20*2=5a ------- 5a=40 ------- a=40/5
a=8

E) 7/a = 28/21
7*21=28a ----- 147=28a -------- a=147/28
a=5.25

f) 9/2 = - 54/a
9a=-54*2 ------- 9a=-108 ----- a=-108/9
a=-12

g) 3/4 = X/2,2
2.2*3=4x ------ 6.6=4x ------ x=6.6/4
x=1.65

H) 0,25/3 = 1,2/a
0.25*a=3*1.2 ------ 0.25a =3.6 ---- a=3.6/0.25
a=14,4

I) 1/3/2/15 = a/4/10 --------15*1/3*2 = a*1 / 4*10
15/6=a/40-------15*40=6a-------6a=600------a=600/6
a=100

j) 3/7/a = 5/9/14 ------ 3*1 / 7*a = 5*1/ 14*9
3/7a=5/126------3*126=5*7a------378=35a------a=378/35
a=10.8

Saludos!!, si tienes alguna duda me dices