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Finding the Fourth Proportional to 92,419.70, 138,629.55 and 80,755.70

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Solution

The fourth proportional to 92,419.70, 138,629.55 and 80,755.70 is: 121,133.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,419.70 : 138,629.55 = 80,755.70 : x
  2. Step 2: Convert to fraction form
    92,419.70/138,629.55 = 80,755.70/x
  3. Step 3: Cross multiply
    92,419.70x = 138,629.55 × 80,755.70
  4. Step 4: Simplify right side
    92,419.70x = 11,195,126,350.94
  5. Step 5: Solve for x
    x = 11,195,126,350.94/92,419.70
  6. Step 6: Final answer
    x = 121,133.55

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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.