Home / 29.20-43.78-8.90

Finding the Fourth Proportional to 29.20, 43.78 and 8.90

Calculator

Solution

The fourth proportional to 29.20, 43.78 and 8.90 is: 13.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.20 : 43.78 = 8.90 : x
  2. Step 2: Convert to fraction form
    29.20/43.78 = 8.90/x
  3. Step 3: Cross multiply
    29.20x = 43.78 × 8.90
  4. Step 4: Simplify right side
    29.20x = 389.64
  5. Step 5: Solve for x
    x = 389.64/29.20
  6. Step 6: Final answer
    x = 13.35

Related Problems

Find fourth proportional to 14.60, 21.89 and 4.45
Half scale
Find fourth proportional to 58.39, 87.56 and 17.80
Double scale
Find fourth proportional to 30.20, 45.28 and 9.90
Similar ratio
Find fourth proportional to 43.79, 65.67 and 13.35
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.