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Finding the Fourth Proportional to 394.28, 591.44 and 137.80

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Solution

The fourth proportional to 394.28, 591.44 and 137.80 is: 206.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.28 : 591.44 = 137.80 : x
  2. Step 2: Convert to fraction form
    394.28/591.44 = 137.80/x
  3. Step 3: Cross multiply
    394.28x = 591.44 × 137.80
  4. Step 4: Simplify right side
    394.28x = 81,500.43
  5. Step 5: Solve for x
    x = 81,500.43/394.28
  6. Step 6: Final answer
    x = 206.71

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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.