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Finding the Fourth Proportional to 20,951.27, 28,913.25 and 11,391.71

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Solution

The fourth proportional to 20,951.27, 28,913.25 and 11,391.71 is: 15,720.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.27 : 28,913.25 = 11,391.71 : x
  2. Step 2: Convert to fraction form
    20,951.27/28,913.25 = 11,391.71/x
  3. Step 3: Cross multiply
    20,951.27x = 28,913.25 × 11,391.71
  4. Step 4: Simplify right side
    20,951.27x = 329,371,214.59
  5. Step 5: Solve for x
    x = 329,371,214.59/20,951.27
  6. Step 6: Final answer
    x = 15,720.82

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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.