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Finding the Fourth Proportional to 220.95, 331.17 and 139.82

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Solution

The fourth proportional to 220.95, 331.17 and 139.82 is: 209.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.95 : 331.17 = 139.82 : x
  2. Step 2: Convert to fraction form
    220.95/331.17 = 139.82/x
  3. Step 3: Cross multiply
    220.95x = 331.17 × 139.82
  4. Step 4: Simplify right side
    220.95x = 46,302.53
  5. Step 5: Solve for x
    x = 46,302.53/220.95
  6. Step 6: Final answer
    x = 209.56

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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.