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Finding the Fourth Proportional to 399,888, 551,845.31 and 218,600.69

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Solution

The fourth proportional to 399,888, 551,845.31 and 218,600.69 is: 301,668.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,888 : 551,845.31 = 218,600.69 : x
  2. Step 2: Convert to fraction form
    399,888/551,845.31 = 218,600.69/x
  3. Step 3: Cross multiply
    399,888x = 551,845.31 × 218,600.69
  4. Step 4: Simplify right side
    399,888x = 120,633,761,687.03
  5. Step 5: Solve for x
    x = 120,633,761,687.03/399,888
  6. Step 6: Final answer
    x = 301,668.87

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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.