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Finding the Fourth Proportional to 220.17, 330.19 and 75.87

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Solution

The fourth proportional to 220.17, 330.19 and 75.87 is: 113.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.17 : 330.19 = 75.87 : x
  2. Step 2: Convert to fraction form
    220.17/330.19 = 75.87/x
  3. Step 3: Cross multiply
    220.17x = 330.19 × 75.87
  4. Step 4: Simplify right side
    220.17x = 25,051.52
  5. Step 5: Solve for x
    x = 25,051.52/220.17
  6. Step 6: Final answer
    x = 113.78

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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.