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Finding the Fourth Proportional to 331,639.80, 496,401.30 and 261,655.80

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Solution

The fourth proportional to 331,639.80, 496,401.30 and 261,655.80 is: 391,648.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    331,639.80 : 496,401.30 = 261,655.80 : x
  2. Step 2: Convert to fraction form
    331,639.80/496,401.30 = 261,655.80/x
  3. Step 3: Cross multiply
    331,639.80x = 496,401.30 × 261,655.80
  4. Step 4: Simplify right side
    331,639.80x = 129,886,279,272.54
  5. Step 5: Solve for x
    x = 129,886,279,272.54/331,639.80
  6. Step 6: Final answer
    x = 391,648.65

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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.