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Finding the Fourth Proportional to 257.24, 385.45 and 199.33

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Solution

The fourth proportional to 257.24, 385.45 and 199.33 is: 298.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.24 : 385.45 = 199.33 : x
  2. Step 2: Convert to fraction form
    257.24/385.45 = 199.33/x
  3. Step 3: Cross multiply
    257.24x = 385.45 × 199.33
  4. Step 4: Simplify right side
    257.24x = 76,831.75
  5. Step 5: Solve for x
    x = 76,831.75/257.24
  6. Step 6: Final answer
    x = 298.68

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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.