Home / 3,989.28-5,505.12-2,220.85

Finding the Fourth Proportional to 3,989.28, 5,505.12 and 2,220.85

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Solution

The fourth proportional to 3,989.28, 5,505.12 and 2,220.85 is: 3,064.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.28 : 5,505.12 = 2,220.85 : x
  2. Step 2: Convert to fraction form
    3,989.28/5,505.12 = 2,220.85/x
  3. Step 3: Cross multiply
    3,989.28x = 5,505.12 × 2,220.85
  4. Step 4: Simplify right side
    3,989.28x = 12,226,045.75
  5. Step 5: Solve for x
    x = 12,226,045.75/3,989.28
  6. Step 6: Final answer
    x = 3,064.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.