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Finding the Fourth Proportional to 76,562.60, 114,519.90 and 68,721.80

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Solution

The fourth proportional to 76,562.60, 114,519.90 and 68,721.80 is: 102,791.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,562.60 : 114,519.90 = 68,721.80 : x
  2. Step 2: Convert to fraction form
    76,562.60/114,519.90 = 68,721.80/x
  3. Step 3: Cross multiply
    76,562.60x = 114,519.90 × 68,721.80
  4. Step 4: Simplify right side
    76,562.60x = 7,870,013,663.82
  5. Step 5: Solve for x
    x = 7,870,013,663.82/76,562.60
  6. Step 6: Final answer
    x = 102,791.88

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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.