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Finding the Fourth Proportional to 399,317.78, 551,054.34 and 218,029.14

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Solution

The fourth proportional to 399,317.78, 551,054.34 and 218,029.14 is: 300,877.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,317.78 : 551,054.34 = 218,029.14 : x
  2. Step 2: Convert to fraction form
    399,317.78/551,054.34 = 218,029.14/x
  3. Step 3: Cross multiply
    399,317.78x = 551,054.34 × 218,029.14
  4. Step 4: Simplify right side
    399,317.78x = 120,145,903,843.47
  5. Step 5: Solve for x
    x = 120,145,903,843.47/399,317.78
  6. Step 6: Final answer
    x = 300,877.93

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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.