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Finding the Fourth Proportional to 331,239.20, 496,858.80 and 81,921.20

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Solution

The fourth proportional to 331,239.20, 496,858.80 and 81,921.20 is: 122,881.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    331,239.20 : 496,858.80 = 81,921.20 : x
  2. Step 2: Convert to fraction form
    331,239.20/496,858.80 = 81,921.20/x
  3. Step 3: Cross multiply
    331,239.20x = 496,858.80 × 81,921.20
  4. Step 4: Simplify right side
    331,239.20x = 40,703,269,126.56
  5. Step 5: Solve for x
    x = 40,703,269,126.56/331,239.20
  6. Step 6: Final answer
    x = 122,881.80

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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.