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Finding the Fourth Proportional to 81,344.80, 122,017.20 and 77,456.80

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Solution

The fourth proportional to 81,344.80, 122,017.20 and 77,456.80 is: 116,185.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,344.80 : 122,017.20 = 77,456.80 : x
  2. Step 2: Convert to fraction form
    81,344.80/122,017.20 = 77,456.80/x
  3. Step 3: Cross multiply
    81,344.80x = 122,017.20 × 77,456.80
  4. Step 4: Simplify right side
    81,344.80x = 9,451,061,856.96
  5. Step 5: Solve for x
    x = 9,451,061,856.96/81,344.80
  6. Step 6: Final answer
    x = 116,185.20

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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.