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Finding the Fourth Proportional to 20,753.29, 28,640 and 11,321.85

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Solution

The fourth proportional to 20,753.29, 28,640 and 11,321.85 is: 15,624.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,753.29 : 28,640 = 11,321.85 : x
  2. Step 2: Convert to fraction form
    20,753.29/28,640 = 11,321.85/x
  3. Step 3: Cross multiply
    20,753.29x = 28,640 × 11,321.85
  4. Step 4: Simplify right side
    20,753.29x = 324,257,784
  5. Step 5: Solve for x
    x = 324,257,784/20,753.29
  6. Step 6: Final answer
    x = 15,624.40

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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.