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Finding the Fourth Proportional to 251.76, 347.11 and 238.71

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Solution

The fourth proportional to 251.76, 347.11 and 238.71 is: 329.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.76 : 347.11 = 238.71 : x
  2. Step 2: Convert to fraction form
    251.76/347.11 = 238.71/x
  3. Step 3: Cross multiply
    251.76x = 347.11 × 238.71
  4. Step 4: Simplify right side
    251.76x = 82,858.63
  5. Step 5: Solve for x
    x = 82,858.63/251.76
  6. Step 6: Final answer
    x = 329.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.