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Finding the Fourth Proportional to 399,372, 551,134.31 and 218,084.28

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Solution

The fourth proportional to 399,372, 551,134.31 and 218,084.28 is: 300,956.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,372 : 551,134.31 = 218,084.28 : x
  2. Step 2: Convert to fraction form
    399,372/551,134.31 = 218,084.28/x
  3. Step 3: Cross multiply
    399,372x = 551,134.31 × 218,084.28
  4. Step 4: Simplify right side
    399,372x = 120,193,729,179.65
  5. Step 5: Solve for x
    x = 120,193,729,179.65/399,372
  6. Step 6: Final answer
    x = 300,956.83

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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.