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Finding the Fourth Proportional to 399,305.30, 551,042.46 and 218,018.79

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Solution

The fourth proportional to 399,305.30, 551,042.46 and 218,018.79 is: 300,866.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,305.30 : 551,042.46 = 218,018.79 : x
  2. Step 2: Convert to fraction form
    399,305.30/551,042.46 = 218,018.79/x
  3. Step 3: Cross multiply
    399,305.30x = 551,042.46 × 218,018.79
  4. Step 4: Simplify right side
    399,305.30x = 120,137,610,367.82
  5. Step 5: Solve for x
    x = 120,137,610,367.82/399,305.30
  6. Step 6: Final answer
    x = 300,866.56

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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.