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Finding the Fourth Proportional to 517.78, 773.67 and 391.87

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Solution

The fourth proportional to 517.78, 773.67 and 391.87 is: 585.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.78 : 773.67 = 391.87 : x
  2. Step 2: Convert to fraction form
    517.78/773.67 = 391.87/x
  3. Step 3: Cross multiply
    517.78x = 773.67 × 391.87
  4. Step 4: Simplify right side
    517.78x = 303,178.06
  5. Step 5: Solve for x
    x = 303,178.06/517.78
  6. Step 6: Final answer
    x = 585.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.