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Finding the Fourth Proportional to 221,639.10, 332,458.65 and 218,139.90

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Solution

The fourth proportional to 221,639.10, 332,458.65 and 218,139.90 is: 327,209.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,639.10 : 332,458.65 = 218,139.90 : x
  2. Step 2: Convert to fraction form
    221,639.10/332,458.65 = 218,139.90/x
  3. Step 3: Cross multiply
    221,639.10x = 332,458.65 × 218,139.90
  4. Step 4: Simplify right side
    221,639.10x = 72,522,496,665.14
  5. Step 5: Solve for x
    x = 72,522,496,665.14/221,639.10
  6. Step 6: Final answer
    x = 327,209.85

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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.