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Finding the Fourth Proportional to 220.05, 330.35 and 128.93

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Solution

The fourth proportional to 220.05, 330.35 and 128.93 is: 193.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.05 : 330.35 = 128.93 : x
  2. Step 2: Convert to fraction form
    220.05/330.35 = 128.93/x
  3. Step 3: Cross multiply
    220.05x = 330.35 × 128.93
  4. Step 4: Simplify right side
    220.05x = 42,589.73
  5. Step 5: Solve for x
    x = 42,589.73/220.05
  6. Step 6: Final answer
    x = 193.55

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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.