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Finding the Fourth Proportional to 20,240.97, 30,319.61 and 18,764.61

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Solution

The fourth proportional to 20,240.97, 30,319.61 and 18,764.61 is: 28,108.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,240.97 : 30,319.61 = 18,764.61 : x
  2. Step 2: Convert to fraction form
    20,240.97/30,319.61 = 18,764.61/x
  3. Step 3: Cross multiply
    20,240.97x = 30,319.61 × 18,764.61
  4. Step 4: Simplify right side
    20,240.97x = 568,935,563.18
  5. Step 5: Solve for x
    x = 568,935,563.18/20,240.97
  6. Step 6: Final answer
    x = 28,108.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.