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Finding the Fourth Proportional to 28,086.52, 38,758.86 and 15,511

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Solution

The fourth proportional to 28,086.52, 38,758.86 and 15,511 is: 21,404.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,086.52 : 38,758.86 = 15,511 : x
  2. Step 2: Convert to fraction form
    28,086.52/38,758.86 = 15,511/x
  3. Step 3: Cross multiply
    28,086.52x = 38,758.86 × 15,511
  4. Step 4: Simplify right side
    28,086.52x = 601,188,677.46
  5. Step 5: Solve for x
    x = 601,188,677.46/28,086.52
  6. Step 6: Final answer
    x = 21,404.88

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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.