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Finding the Fourth Proportional to 266.88, 398.22 and 239.61

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Solution

The fourth proportional to 266.88, 398.22 and 239.61 is: 357.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.88 : 398.22 = 239.61 : x
  2. Step 2: Convert to fraction form
    266.88/398.22 = 239.61/x
  3. Step 3: Cross multiply
    266.88x = 398.22 × 239.61
  4. Step 4: Simplify right side
    266.88x = 95,414.90
  5. Step 5: Solve for x
    x = 95,414.90/266.88
  6. Step 6: Final answer
    x = 357.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.