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Finding the Fourth Proportional to 257.58, 385.16 and 217.49

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Solution

The fourth proportional to 257.58, 385.16 and 217.49 is: 325.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.58 : 385.16 = 217.49 : x
  2. Step 2: Convert to fraction form
    257.58/385.16 = 217.49/x
  3. Step 3: Cross multiply
    257.58x = 385.16 × 217.49
  4. Step 4: Simplify right side
    257.58x = 83,765.44
  5. Step 5: Solve for x
    x = 83,765.44/257.58
  6. Step 6: Final answer
    x = 325.20

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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.