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Finding the Fourth Proportional to 399,485.31, 551,286.91 and 218,197.28

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Solution

The fourth proportional to 399,485.31, 551,286.91 and 218,197.28 is: 301,110.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,485.31 : 551,286.91 = 218,197.28 : x
  2. Step 2: Convert to fraction form
    399,485.31/551,286.91 = 218,197.28/x
  3. Step 3: Cross multiply
    399,485.31x = 551,286.91 × 218,197.28
  4. Step 4: Simplify right side
    399,485.31x = 120,289,305,912.57
  5. Step 5: Solve for x
    x = 120,289,305,912.57/399,485.31
  6. Step 6: Final answer
    x = 301,110.71

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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.