Question

The fourth proportional to 1.2, 3.9 and 2 is ____

a. 6.5
b. 5.6
c.1.6
d.4​

Answer 1

Answer:

.4​

Step-by-step explanation:

I GUESS ITS CORRECT

Answer 2

Answer:

• a. 6.5

Step-by-step explanation:

Given

• 1.2 : 3.9 :: 2 : x

To find

• The fourth proportional (x)

Solution

↦ Product of means = Product of extremes

• 3.9 × 2 = 1.2 × x
• 7.8 = 1.2x
• x = 7.8/1.2
• x = 6.5

∴ Fourth proportional (x) is 6.5.