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Finding the Fourth Proportional to 394.75, 592.13 and 138.25

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Solution

The fourth proportional to 394.75, 592.13 and 138.25 is: 207.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.75 : 592.13 = 138.25 : x
  2. Step 2: Convert to fraction form
    394.75/592.13 = 138.25/x
  3. Step 3: Cross multiply
    394.75x = 592.13 × 138.25
  4. Step 4: Simplify right side
    394.75x = 81,861.97
  5. Step 5: Solve for x
    x = 81,861.97/394.75
  6. Step 6: Final answer
    x = 207.38

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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.