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Finding the Fourth Proportional to 92,003.70, 138,005.55 and 81,981.30

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Solution

The fourth proportional to 92,003.70, 138,005.55 and 81,981.30 is: 122,971.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,003.70 : 138,005.55 = 81,981.30 : x
  2. Step 2: Convert to fraction form
    92,003.70/138,005.55 = 81,981.30/x
  3. Step 3: Cross multiply
    92,003.70x = 138,005.55 × 81,981.30
  4. Step 4: Simplify right side
    92,003.70x = 11,313,874,396.22
  5. Step 5: Solve for x
    x = 11,313,874,396.22/92,003.70
  6. Step 6: Final answer
    x = 122,971.95

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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.