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Finding the Fourth Proportional to 20,792.61, 28,691.15 and 11,838.87

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Solution

The fourth proportional to 20,792.61, 28,691.15 and 11,838.87 is: 16,336.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,792.61 : 28,691.15 = 11,838.87 : x
  2. Step 2: Convert to fraction form
    20,792.61/28,691.15 = 11,838.87/x
  3. Step 3: Cross multiply
    20,792.61x = 28,691.15 × 11,838.87
  4. Step 4: Simplify right side
    20,792.61x = 339,670,735.81
  5. Step 5: Solve for x
    x = 339,670,735.81/20,792.61
  6. Step 6: Final answer
    x = 16,336.13

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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.