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Finding the Fourth Proportional to 220.30, 330.39 and 76

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Solution

The fourth proportional to 220.30, 330.39 and 76 is: 113.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.30 : 330.39 = 76 : x
  2. Step 2: Convert to fraction form
    220.30/330.39 = 76/x
  3. Step 3: Cross multiply
    220.30x = 330.39 × 76
  4. Step 4: Simplify right side
    220.30x = 25,109.64
  5. Step 5: Solve for x
    x = 25,109.64/220.30
  6. Step 6: Final answer
    x = 113.98

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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.