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Finding the Fourth Proportional to 128,589.71, 192,791.10 and 53,731.28

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Solution

The fourth proportional to 128,589.71, 192,791.10 and 53,731.28 is: 80,557.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,589.71 : 192,791.10 = 53,731.28 : x
  2. Step 2: Convert to fraction form
    128,589.71/192,791.10 = 53,731.28/x
  3. Step 3: Cross multiply
    128,589.71x = 192,791.10 × 53,731.28
  4. Step 4: Simplify right side
    128,589.71x = 10,358,912,575.61
  5. Step 5: Solve for x
    x = 10,358,912,575.61/128,589.71
  6. Step 6: Final answer
    x = 80,557.87

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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.