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Finding the Fourth Proportional to 80,263.31, 120,512.88 and 78,845.87

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Solution

The fourth proportional to 80,263.31, 120,512.88 and 78,845.87 is: 118,384.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,263.31 : 120,512.88 = 78,845.87 : x
  2. Step 2: Convert to fraction form
    80,263.31/120,512.88 = 78,845.87/x
  3. Step 3: Cross multiply
    80,263.31x = 120,512.88 × 78,845.87
  4. Step 4: Simplify right side
    80,263.31x = 9,501,943,171.09
  5. Step 5: Solve for x
    x = 9,501,943,171.09/80,263.31
  6. Step 6: Final answer
    x = 118,384.65

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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.