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Finding the Fourth Proportional to 81,593.87, 122,292.38 and 42,129.45

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Solution

The fourth proportional to 81,593.87, 122,292.38 and 42,129.45 is: 63,143.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,593.87 : 122,292.38 = 42,129.45 : x
  2. Step 2: Convert to fraction form
    81,593.87/122,292.38 = 42,129.45/x
  3. Step 3: Cross multiply
    81,593.87x = 122,292.38 × 42,129.45
  4. Step 4: Simplify right side
    81,593.87x = 5,152,110,813.91
  5. Step 5: Solve for x
    x = 5,152,110,813.91/81,593.87
  6. Step 6: Final answer
    x = 63,143.36

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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.