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Finding the Fourth Proportional to 392,963.78, 542,290.02 and 214,115.78

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Solution

The fourth proportional to 392,963.78, 542,290.02 and 214,115.78 is: 295,479.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,963.78 : 542,290.02 = 214,115.78 : x
  2. Step 2: Convert to fraction form
    392,963.78/542,290.02 = 214,115.78/x
  3. Step 3: Cross multiply
    392,963.78x = 542,290.02 × 214,115.78
  4. Step 4: Simplify right side
    392,963.78x = 116,112,850,618.52
  5. Step 5: Solve for x
    x = 116,112,850,618.52/392,963.78
  6. Step 6: Final answer
    x = 295,479.78

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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.