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Finding the Fourth Proportional to 399,809, 551,721.38 and 218,519.44

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Solution

The fourth proportional to 399,809, 551,721.38 and 218,519.44 is: 301,548.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,809 : 551,721.38 = 218,519.44 : x
  2. Step 2: Convert to fraction form
    399,809/551,721.38 = 218,519.44/x
  3. Step 3: Cross multiply
    399,809x = 551,721.38 × 218,519.44
  4. Step 4: Simplify right side
    399,809x = 120,561,846,993.63
  5. Step 5: Solve for x
    x = 120,561,846,993.63/399,809
  6. Step 6: Final answer
    x = 301,548.61

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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.