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Finding the Fourth Proportional to 386,616.90, 579,234.15 and 331,320.90

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Solution

The fourth proportional to 386,616.90, 579,234.15 and 331,320.90 is: 496,389.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,616.90 : 579,234.15 = 331,320.90 : x
  2. Step 2: Convert to fraction form
    386,616.90/579,234.15 = 331,320.90/x
  3. Step 3: Cross multiply
    386,616.90x = 579,234.15 × 331,320.90
  4. Step 4: Simplify right side
    386,616.90x = 191,912,379,888.74
  5. Step 5: Solve for x
    x = 191,912,379,888.74/386,616.90
  6. Step 6: Final answer
    x = 496,389.01

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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.