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Finding the Fourth Proportional to 627.05, 939.56 and 517.70

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Solution

The fourth proportional to 627.05, 939.56 and 517.70 is: 775.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.05 : 939.56 = 517.70 : x
  2. Step 2: Convert to fraction form
    627.05/939.56 = 517.70/x
  3. Step 3: Cross multiply
    627.05x = 939.56 × 517.70
  4. Step 4: Simplify right side
    627.05x = 486,402.93
  5. Step 5: Solve for x
    x = 486,402.93/627.05
  6. Step 6: Final answer
    x = 775.71

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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.