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Finding the Fourth Proportional to 251.17, 376.78 and 217.15

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Solution

The fourth proportional to 251.17, 376.78 and 217.15 is: 325.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.17 : 376.78 = 217.15 : x
  2. Step 2: Convert to fraction form
    251.17/376.78 = 217.15/x
  3. Step 3: Cross multiply
    251.17x = 376.78 × 217.15
  4. Step 4: Simplify right side
    251.17x = 81,817.78
  5. Step 5: Solve for x
    x = 81,817.78/251.17
  6. Step 6: Final answer
    x = 325.75

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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.