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Finding the Fourth Proportional to 20,801.52, 28,705.68 and 11,369.88

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Solution

The fourth proportional to 20,801.52, 28,705.68 and 11,369.88 is: 15,690.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,801.52 : 28,705.68 = 11,369.88 : x
  2. Step 2: Convert to fraction form
    20,801.52/28,705.68 = 11,369.88/x
  3. Step 3: Cross multiply
    20,801.52x = 28,705.68 × 11,369.88
  4. Step 4: Simplify right side
    20,801.52x = 326,380,136.92
  5. Step 5: Solve for x
    x = 326,380,136.92/20,801.52
  6. Step 6: Final answer
    x = 15,690.21

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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.