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Finding the Fourth Proportional to 128.20, 193 and 104.06

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Solution

The fourth proportional to 128.20, 193 and 104.06 is: 156.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.20 : 193 = 104.06 : x
  2. Step 2: Convert to fraction form
    128.20/193 = 104.06/x
  3. Step 3: Cross multiply
    128.20x = 193 × 104.06
  4. Step 4: Simplify right side
    128.20x = 20,083.58
  5. Step 5: Solve for x
    x = 20,083.58/128.20
  6. Step 6: Final answer
    x = 156.66

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.