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Finding the Fourth Proportional to 220.25, 330.28 and 75.87

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Solution

The fourth proportional to 220.25, 330.28 and 75.87 is: 113.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.25 : 330.28 = 75.87 : x
  2. Step 2: Convert to fraction form
    220.25/330.28 = 75.87/x
  3. Step 3: Cross multiply
    220.25x = 330.28 × 75.87
  4. Step 4: Simplify right side
    220.25x = 25,058.15
  5. Step 5: Solve for x
    x = 25,058.15/220.25
  6. Step 6: Final answer
    x = 113.77

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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.