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Finding the Fourth Proportional to 257.68, 385.96 and 218.96

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Solution

The fourth proportional to 257.68, 385.96 and 218.96 is: 327.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.68 : 385.96 = 218.96 : x
  2. Step 2: Convert to fraction form
    257.68/385.96 = 218.96/x
  3. Step 3: Cross multiply
    257.68x = 385.96 × 218.96
  4. Step 4: Simplify right side
    257.68x = 84,509.80
  5. Step 5: Solve for x
    x = 84,509.80/257.68
  6. Step 6: Final answer
    x = 327.96

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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.