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Finding the Fourth Proportional to 238.99, 358.45 and 76.65

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Solution

The fourth proportional to 238.99, 358.45 and 76.65 is: 114.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.99 : 358.45 = 76.65 : x
  2. Step 2: Convert to fraction form
    238.99/358.45 = 76.65/x
  3. Step 3: Cross multiply
    238.99x = 358.45 × 76.65
  4. Step 4: Simplify right side
    238.99x = 27,474.56
  5. Step 5: Solve for x
    x = 27,474.56/238.99
  6. Step 6: Final answer
    x = 114.96

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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.