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Finding the Fourth Proportional to 92,712.96, 138,398 and 81,503.04

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Solution

The fourth proportional to 92,712.96, 138,398 and 81,503.04 is: 121,664.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,712.96 : 138,398 = 81,503.04 : x
  2. Step 2: Convert to fraction form
    92,712.96/138,398 = 81,503.04/x
  3. Step 3: Cross multiply
    92,712.96x = 138,398 × 81,503.04
  4. Step 4: Simplify right side
    92,712.96x = 11,279,857,729.92
  5. Step 5: Solve for x
    x = 11,279,857,729.92/92,712.96
  6. Step 6: Final answer
    x = 121,664.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.