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Finding the Fourth Proportional to 220.52, 330.72 and 139.28

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Solution

The fourth proportional to 220.52, 330.72 and 139.28 is: 208.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.52 : 330.72 = 139.28 : x
  2. Step 2: Convert to fraction form
    220.52/330.72 = 139.28/x
  3. Step 3: Cross multiply
    220.52x = 330.72 × 139.28
  4. Step 4: Simplify right side
    220.52x = 46,062.68
  5. Step 5: Solve for x
    x = 46,062.68/220.52
  6. Step 6: Final answer
    x = 208.88

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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.