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Finding the Fourth Proportional to 251.28, 375.09 and 218.73

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Solution

The fourth proportional to 251.28, 375.09 and 218.73 is: 326.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.28 : 375.09 = 218.73 : x
  2. Step 2: Convert to fraction form
    251.28/375.09 = 218.73/x
  3. Step 3: Cross multiply
    251.28x = 375.09 × 218.73
  4. Step 4: Simplify right side
    251.28x = 82,043.44
  5. Step 5: Solve for x
    x = 82,043.44/251.28
  6. Step 6: Final answer
    x = 326.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.