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Finding the Fourth Proportional to 278,915.97, 418,383.90 and 89,351.73

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Solution

The fourth proportional to 278,915.97, 418,383.90 and 89,351.73 is: 134,030.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,915.97 : 418,383.90 = 89,351.73 : x
  2. Step 2: Convert to fraction form
    278,915.97/418,383.90 = 89,351.73/x
  3. Step 3: Cross multiply
    278,915.97x = 418,383.90 × 89,351.73
  4. Step 4: Simplify right side
    278,915.97x = 37,383,325,269.15
  5. Step 5: Solve for x
    x = 37,383,325,269.15/278,915.97
  6. Step 6: Final answer
    x = 134,030.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.