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Finding the Fourth Proportional to 679,940.20, 938,318.42 and 378,134.20

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Solution

The fourth proportional to 679,940.20, 938,318.42 and 378,134.20 is: 521,825.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,940.20 : 938,318.42 = 378,134.20 : x
  2. Step 2: Convert to fraction form
    679,940.20/938,318.42 = 378,134.20/x
  3. Step 3: Cross multiply
    679,940.20x = 938,318.42 × 378,134.20
  4. Step 4: Simplify right side
    679,940.20x = 354,810,285,091.96
  5. Step 5: Solve for x
    x = 354,810,285,091.96/679,940.20
  6. Step 6: Final answer
    x = 521,825.72

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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.