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Finding the Fourth Proportional to 221,426.60, 332,139.90 and 81,239.90

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Solution

The fourth proportional to 221,426.60, 332,139.90 and 81,239.90 is: 121,859.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,426.60 : 332,139.90 = 81,239.90 : x
  2. Step 2: Convert to fraction form
    221,426.60/332,139.90 = 81,239.90/x
  3. Step 3: Cross multiply
    221,426.60x = 332,139.90 × 81,239.90
  4. Step 4: Simplify right side
    221,426.60x = 26,983,012,262.01
  5. Step 5: Solve for x
    x = 26,983,012,262.01/221,426.60
  6. Step 6: Final answer
    x = 121,859.85

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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.