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Finding the Fourth Proportional to 238.92, 358.34 and 76.61

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Solution

The fourth proportional to 238.92, 358.34 and 76.61 is: 114.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.92 : 358.34 = 76.61 : x
  2. Step 2: Convert to fraction form
    238.92/358.34 = 76.61/x
  3. Step 3: Cross multiply
    238.92x = 358.34 × 76.61
  4. Step 4: Simplify right side
    238.92x = 27,450.25
  5. Step 5: Solve for x
    x = 27,450.25/238.92
  6. Step 6: Final answer
    x = 114.89

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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.