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Finding the Fourth Proportional to 252.78, 348.40 and 217.74

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Solution

The fourth proportional to 252.78, 348.40 and 217.74 is: 300.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.78 : 348.40 = 217.74 : x
  2. Step 2: Convert to fraction form
    252.78/348.40 = 217.74/x
  3. Step 3: Cross multiply
    252.78x = 348.40 × 217.74
  4. Step 4: Simplify right side
    252.78x = 75,860.62
  5. Step 5: Solve for x
    x = 75,860.62/252.78
  6. Step 6: Final answer
    x = 300.11

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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.