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Finding the Fourth Proportional to 617.31, 850.70 and 395.87

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Solution

The fourth proportional to 617.31, 850.70 and 395.87 is: 545.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.31 : 850.70 = 395.87 : x
  2. Step 2: Convert to fraction form
    617.31/850.70 = 395.87/x
  3. Step 3: Cross multiply
    617.31x = 850.70 × 395.87
  4. Step 4: Simplify right side
    617.31x = 336,760.38
  5. Step 5: Solve for x
    x = 336,760.38/617.31
  6. Step 6: Final answer
    x = 545.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.