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Finding the Third Proportional to 478 and 605

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Solution

The third proportional to 478 and 605 is: 765.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    478 : 605 = 605 : x
  2. Step 2: Convert to fraction form
    478/605 = 605/x
  3. Step 3: Cross multiply
    478x = 605 × 605
  4. Step 4: Simplify right side
    478x = 366,025
  5. Step 5: Solve for x
    x = 366,025/478
  6. Step 6: Final answer
    x = 765.74

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.