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Finding the Fourth Proportional to 238.81, 358.09 and 76.45

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Solution

The fourth proportional to 238.81, 358.09 and 76.45 is: 114.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.81 : 358.09 = 76.45 : x
  2. Step 2: Convert to fraction form
    238.81/358.09 = 76.45/x
  3. Step 3: Cross multiply
    238.81x = 358.09 × 76.45
  4. Step 4: Simplify right side
    238.81x = 27,375.98
  5. Step 5: Solve for x
    x = 27,375.98/238.81
  6. Step 6: Final answer
    x = 114.63

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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.