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Finding the Fourth Proportional to 249.81, 342.87 and 239.79

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Solution

The fourth proportional to 249.81, 342.87 and 239.79 is: 329.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.81 : 342.87 = 239.79 : x
  2. Step 2: Convert to fraction form
    249.81/342.87 = 239.79/x
  3. Step 3: Cross multiply
    249.81x = 342.87 × 239.79
  4. Step 4: Simplify right side
    249.81x = 82,216.80
  5. Step 5: Solve for x
    x = 82,216.80/249.81
  6. Step 6: Final answer
    x = 329.12

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.