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Finding the Fourth Proportional to 676.87, 1,015.08 and 265.90

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Solution

The fourth proportional to 676.87, 1,015.08 and 265.90 is: 398.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.87 : 1,015.08 = 265.90 : x
  2. Step 2: Convert to fraction form
    676.87/1,015.08 = 265.90/x
  3. Step 3: Cross multiply
    676.87x = 1,015.08 × 265.90
  4. Step 4: Simplify right side
    676.87x = 269,909.77
  5. Step 5: Solve for x
    x = 269,909.77/676.87
  6. Step 6: Final answer
    x = 398.76

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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.