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Finding the Fourth Proportional to 399,279.61, 551,013.65 and 217,992

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Solution

The fourth proportional to 399,279.61, 551,013.65 and 217,992 is: 300,833.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,279.61 : 551,013.65 = 217,992 : x
  2. Step 2: Convert to fraction form
    399,279.61/551,013.65 = 217,992/x
  3. Step 3: Cross multiply
    399,279.61x = 551,013.65 × 217,992
  4. Step 4: Simplify right side
    399,279.61x = 120,116,567,590.80
  5. Step 5: Solve for x
    x = 120,116,567,590.80/399,279.61
  6. Step 6: Final answer
    x = 300,833.21

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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.