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Finding the Fourth Proportional to 20,910.92, 28,857.68 and 11,480.08

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Solution

The fourth proportional to 20,910.92, 28,857.68 and 11,480.08 is: 15,842.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.92 : 28,857.68 = 11,480.08 : x
  2. Step 2: Convert to fraction form
    20,910.92/28,857.68 = 11,480.08/x
  3. Step 3: Cross multiply
    20,910.92x = 28,857.68 × 11,480.08
  4. Step 4: Simplify right side
    20,910.92x = 331,288,475.01
  5. Step 5: Solve for x
    x = 331,288,475.01/20,910.92
  6. Step 6: Final answer
    x = 15,842.85

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.