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Finding the Fourth Proportional to 18,943.61, 28,415.39 and 5,092.61

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Solution

The fourth proportional to 18,943.61, 28,415.39 and 5,092.61 is: 7,638.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,943.61 : 28,415.39 = 5,092.61 : x
  2. Step 2: Convert to fraction form
    18,943.61/28,415.39 = 5,092.61/x
  3. Step 3: Cross multiply
    18,943.61x = 28,415.39 × 5,092.61
  4. Step 4: Simplify right side
    18,943.61x = 144,708,331.73
  5. Step 5: Solve for x
    x = 144,708,331.73/18,943.61
  6. Step 6: Final answer
    x = 7,638.90

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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.