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Finding the Fourth Proportional to 257.15, 385.23 and 199.34

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Solution

The fourth proportional to 257.15, 385.23 and 199.34 is: 298.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.15 : 385.23 = 199.34 : x
  2. Step 2: Convert to fraction form
    257.15/385.23 = 199.34/x
  3. Step 3: Cross multiply
    257.15x = 385.23 × 199.34
  4. Step 4: Simplify right side
    257.15x = 76,791.75
  5. Step 5: Solve for x
    x = 76,791.75/257.15
  6. Step 6: Final answer
    x = 298.63

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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.