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Finding the Fourth Proportional to 220.26, 329.85 and 143.28

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Solution

The fourth proportional to 220.26, 329.85 and 143.28 is: 214.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.26 : 329.85 = 143.28 : x
  2. Step 2: Convert to fraction form
    220.26/329.85 = 143.28/x
  3. Step 3: Cross multiply
    220.26x = 329.85 × 143.28
  4. Step 4: Simplify right side
    220.26x = 47,260.91
  5. Step 5: Solve for x
    x = 47,260.91/220.26
  6. Step 6: Final answer
    x = 214.57

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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.