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Finding the Fourth Proportional to 251.85, 378.15 and 239.47

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Solution

The fourth proportional to 251.85, 378.15 and 239.47 is: 359.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.85 : 378.15 = 239.47 : x
  2. Step 2: Convert to fraction form
    251.85/378.15 = 239.47/x
  3. Step 3: Cross multiply
    251.85x = 378.15 × 239.47
  4. Step 4: Simplify right side
    251.85x = 90,555.58
  5. Step 5: Solve for x
    x = 90,555.58/251.85
  6. Step 6: Final answer
    x = 359.56

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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.