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Finding the Fourth Proportional to 399,394.77, 551,144.25 and 218,071.77

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Solution

The fourth proportional to 399,394.77, 551,144.25 and 218,071.77 is: 300,927.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,394.77 : 551,144.25 = 218,071.77 : x
  2. Step 2: Convert to fraction form
    399,394.77/551,144.25 = 218,071.77/x
  3. Step 3: Cross multiply
    399,394.77x = 551,144.25 × 218,071.77
  4. Step 4: Simplify right side
    399,394.77x = 120,189,002,122.82
  5. Step 5: Solve for x
    x = 120,189,002,122.82/399,394.77
  6. Step 6: Final answer
    x = 300,927.83

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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.