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Finding the Fourth Proportional to 394.27, 591.40 and 231.76

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Solution

The fourth proportional to 394.27, 591.40 and 231.76 is: 347.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.27 : 591.40 = 231.76 : x
  2. Step 2: Convert to fraction form
    394.27/591.40 = 231.76/x
  3. Step 3: Cross multiply
    394.27x = 591.40 × 231.76
  4. Step 4: Simplify right side
    394.27x = 137,063.89
  5. Step 5: Solve for x
    x = 137,063.89/394.27
  6. Step 6: Final answer
    x = 347.64

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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.