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Finding the Fourth Proportional to 239.13, 358.72 and 76.83

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Solution

The fourth proportional to 239.13, 358.72 and 76.83 is: 115.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.13 : 358.72 = 76.83 : x
  2. Step 2: Convert to fraction form
    239.13/358.72 = 76.83/x
  3. Step 3: Cross multiply
    239.13x = 358.72 × 76.83
  4. Step 4: Simplify right side
    239.13x = 27,558.66
  5. Step 5: Solve for x
    x = 27,558.66/239.13
  6. Step 6: Final answer
    x = 115.25

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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.