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Finding the Fourth Proportional to 399,322.66, 551,067.96 and 218,035.85

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Solution

The fourth proportional to 399,322.66, 551,067.96 and 218,035.85 is: 300,890.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,322.66 : 551,067.96 = 218,035.85 : x
  2. Step 2: Convert to fraction form
    399,322.66/551,067.96 = 218,035.85/x
  3. Step 3: Cross multiply
    399,322.66x = 551,067.96 × 218,035.85
  4. Step 4: Simplify right side
    399,322.66x = 120,152,571,001.97
  5. Step 5: Solve for x
    x = 120,152,571,001.97/399,322.66
  6. Step 6: Final answer
    x = 300,890.94

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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.