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Finding the Fourth Proportional to 220.97, 331.51 and 76.69

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Solution

The fourth proportional to 220.97, 331.51 and 76.69 is: 115.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.97 : 331.51 = 76.69 : x
  2. Step 2: Convert to fraction form
    220.97/331.51 = 76.69/x
  3. Step 3: Cross multiply
    220.97x = 331.51 × 76.69
  4. Step 4: Simplify right side
    220.97x = 25,422.48
  5. Step 5: Solve for x
    x = 25,422.48/220.97
  6. Step 6: Final answer
    x = 115.05

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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.