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Finding the Fourth Proportional to 393.96, 591.10 and 231.61

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Solution

The fourth proportional to 393.96, 591.10 and 231.61 is: 347.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.96 : 591.10 = 231.61 : x
  2. Step 2: Convert to fraction form
    393.96/591.10 = 231.61/x
  3. Step 3: Cross multiply
    393.96x = 591.10 × 231.61
  4. Step 4: Simplify right side
    393.96x = 136,903.72
  5. Step 5: Solve for x
    x = 136,903.72/393.96
  6. Step 6: Final answer
    x = 347.50

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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.