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Finding the Fourth Proportional to 399,809.30, 551,379.55 and 331,718.42

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Solution

The fourth proportional to 399,809.30, 551,379.55 and 331,718.42 is: 457,474.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,809.30 : 551,379.55 = 331,718.42 : x
  2. Step 2: Convert to fraction form
    399,809.30/551,379.55 = 331,718.42/x
  3. Step 3: Cross multiply
    399,809.30x = 551,379.55 × 331,718.42
  4. Step 4: Simplify right side
    399,809.30x = 182,902,753,146.31
  5. Step 5: Solve for x
    x = 182,902,753,146.31/399,809.30
  6. Step 6: Final answer
    x = 457,474.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.