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Finding the Fourth Proportional to 220.95, 331.32 and 129.67

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Solution

The fourth proportional to 220.95, 331.32 and 129.67 is: 194.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.95 : 331.32 = 129.67 : x
  2. Step 2: Convert to fraction form
    220.95/331.32 = 129.67/x
  3. Step 3: Cross multiply
    220.95x = 331.32 × 129.67
  4. Step 4: Simplify right side
    220.95x = 42,962.26
  5. Step 5: Solve for x
    x = 42,962.26/220.95
  6. Step 6: Final answer
    x = 194.44

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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.