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Finding the Fourth Proportional to 220.60, 330.74 and 81.72

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Solution

The fourth proportional to 220.60, 330.74 and 81.72 is: 122.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.60 : 330.74 = 81.72 : x
  2. Step 2: Convert to fraction form
    220.60/330.74 = 81.72/x
  3. Step 3: Cross multiply
    220.60x = 330.74 × 81.72
  4. Step 4: Simplify right side
    220.60x = 27,028.07
  5. Step 5: Solve for x
    x = 27,028.07/220.60
  6. Step 6: Final answer
    x = 122.52

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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.