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Finding the Fourth Proportional to 221,428.10, 332,174.55 and 71,642.90

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Solution

The fourth proportional to 221,428.10, 332,174.55 and 71,642.90 is: 107,474.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,428.10 : 332,174.55 = 71,642.90 : x
  2. Step 2: Convert to fraction form
    221,428.10/332,174.55 = 71,642.90/x
  3. Step 3: Cross multiply
    221,428.10x = 332,174.55 × 71,642.90
  4. Step 4: Simplify right side
    221,428.10x = 23,797,948,068.20
  5. Step 5: Solve for x
    x = 23,797,948,068.20/221,428.10
  6. Step 6: Final answer
    x = 107,474.83

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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.