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Finding the Fourth Proportional to 113.73, 171.21 and 88.20

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Solution

The fourth proportional to 113.73, 171.21 and 88.20 is: 132.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.73 : 171.21 = 88.20 : x
  2. Step 2: Convert to fraction form
    113.73/171.21 = 88.20/x
  3. Step 3: Cross multiply
    113.73x = 171.21 × 88.20
  4. Step 4: Simplify right side
    113.73x = 15,100.72
  5. Step 5: Solve for x
    x = 15,100.72/113.73
  6. Step 6: Final answer
    x = 132.78

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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.