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Finding the Fourth Proportional to 399,367, 551,127.41 and 218,079.28

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Solution

The fourth proportional to 399,367, 551,127.41 and 218,079.28 is: 300,949.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,367 : 551,127.41 = 218,079.28 : x
  2. Step 2: Convert to fraction form
    399,367/551,127.41 = 218,079.28/x
  3. Step 3: Cross multiply
    399,367x = 551,127.41 × 218,079.28
  4. Step 4: Simplify right side
    399,367x = 120,189,468,761.07
  5. Step 5: Solve for x
    x = 120,189,468,761.07/399,367
  6. Step 6: Final answer
    x = 300,949.93

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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.