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Finding the Fourth Proportional to 678,078.78, 935,516.43 and 387,481.56

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Solution

The fourth proportional to 678,078.78, 935,516.43 and 387,481.56 is: 534,591.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,078.78 : 935,516.43 = 387,481.56 : x
  2. Step 2: Convert to fraction form
    678,078.78/935,516.43 = 387,481.56/x
  3. Step 3: Cross multiply
    678,078.78x = 935,516.43 × 387,481.56
  4. Step 4: Simplify right side
    678,078.78x = 362,495,365,702.03
  5. Step 5: Solve for x
    x = 362,495,365,702.03/678,078.78
  6. Step 6: Final answer
    x = 534,591.81

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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.