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Finding the Fourth Proportional to 220.40, 330.19 and 128.83

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Solution

The fourth proportional to 220.40, 330.19 and 128.83 is: 193.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.40 : 330.19 = 128.83 : x
  2. Step 2: Convert to fraction form
    220.40/330.19 = 128.83/x
  3. Step 3: Cross multiply
    220.40x = 330.19 × 128.83
  4. Step 4: Simplify right side
    220.40x = 42,538.38
  5. Step 5: Solve for x
    x = 42,538.38/220.40
  6. Step 6: Final answer
    x = 193.01

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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.