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Finding the Fourth Proportional to 92,001.70, 138,002.55 and 81,979.30

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Solution

The fourth proportional to 92,001.70, 138,002.55 and 81,979.30 is: 122,968.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,001.70 : 138,002.55 = 81,979.30 : x
  2. Step 2: Convert to fraction form
    92,001.70/138,002.55 = 81,979.30/x
  3. Step 3: Cross multiply
    92,001.70x = 138,002.55 × 81,979.30
  4. Step 4: Simplify right side
    92,001.70x = 11,313,352,447.22
  5. Step 5: Solve for x
    x = 11,313,352,447.22/92,001.70
  6. Step 6: Final answer
    x = 122,968.95

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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.