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Finding the Fourth Proportional to 399,145.28, 550,781.28 and 220,285.76

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Solution

The fourth proportional to 399,145.28, 550,781.28 and 220,285.76 is: 303,972.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,145.28 : 550,781.28 = 220,285.76 : x
  2. Step 2: Convert to fraction form
    399,145.28/550,781.28 = 220,285.76/x
  3. Step 3: Cross multiply
    399,145.28x = 550,781.28 × 220,285.76
  4. Step 4: Simplify right side
    399,145.28x = 121,329,272,858.57
  5. Step 5: Solve for x
    x = 121,329,272,858.57/399,145.28
  6. Step 6: Final answer
    x = 303,972.71

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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.