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Finding the Fourth Proportional to 133.56, 199.82 and 115.13

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Solution

The fourth proportional to 133.56, 199.82 and 115.13 is: 172.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.56 : 199.82 = 115.13 : x
  2. Step 2: Convert to fraction form
    133.56/199.82 = 115.13/x
  3. Step 3: Cross multiply
    133.56x = 199.82 × 115.13
  4. Step 4: Simplify right side
    133.56x = 23,003.70
  5. Step 5: Solve for x
    x = 23,003.70/133.56
  6. Step 6: Final answer
    x = 172.23

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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.