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Finding the Fourth Proportional to 220.58, 330.78 and 76.28

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Solution

The fourth proportional to 220.58, 330.78 and 76.28 is: 114.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.58 : 330.78 = 76.28 : x
  2. Step 2: Convert to fraction form
    220.58/330.78 = 76.28/x
  3. Step 3: Cross multiply
    220.58x = 330.78 × 76.28
  4. Step 4: Simplify right side
    220.58x = 25,231.90
  5. Step 5: Solve for x
    x = 25,231.90/220.58
  6. Step 6: Final answer
    x = 114.39

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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.