Home / 3.20-4.80-2

Finding the Fourth Proportional to 3.20, 4.80 and 2

Calculator

Solution

The fourth proportional to 3.20, 4.80 and 2 is: 3.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.20 : 4.80 = 2 : x
  2. Step 2: Convert to fraction form
    3.20/4.80 = 2/x
  3. Step 3: Cross multiply
    3.20x = 4.80 × 2
  4. Step 4: Simplify right side
    3.20x = 9.60
  5. Step 5: Solve for x
    x = 9.60/3.20
  6. Step 6: Final answer
    x = 3.00

Related Problems

Find fourth proportional to 1.60, 2.40 and 1
Half scale
Find fourth proportional to 6.40, 9.60 and 4
Double scale
Find fourth proportional to 4.20, 6.30 and 3
Similar ratio
Find fourth proportional to 4.80, 7.20 and 3
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.