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Finding the Fourth Proportional to 231.97, 348 and 129.21

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Solution

The fourth proportional to 231.97, 348 and 129.21 is: 193.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.97 : 348 = 129.21 : x
  2. Step 2: Convert to fraction form
    231.97/348 = 129.21/x
  3. Step 3: Cross multiply
    231.97x = 348 × 129.21
  4. Step 4: Simplify right side
    231.97x = 44,965.08
  5. Step 5: Solve for x
    x = 44,965.08/231.97
  6. Step 6: Final answer
    x = 193.84

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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.