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Finding the Fourth Proportional to 278,872.10, 418,308.15 and 91,859.30

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Solution

The fourth proportional to 278,872.10, 418,308.15 and 91,859.30 is: 137,788.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,872.10 : 418,308.15 = 91,859.30 : x
  2. Step 2: Convert to fraction form
    278,872.10/418,308.15 = 91,859.30/x
  3. Step 3: Cross multiply
    278,872.10x = 418,308.15 × 91,859.30
  4. Step 4: Simplify right side
    278,872.10x = 38,425,493,843.30
  5. Step 5: Solve for x
    x = 38,425,493,843.30/278,872.10
  6. Step 6: Final answer
    x = 137,788.95

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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.