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Finding the Fourth Proportional to 136.12, 203.66 and 115.56

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Solution

The fourth proportional to 136.12, 203.66 and 115.56 is: 172.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.12 : 203.66 = 115.56 : x
  2. Step 2: Convert to fraction form
    136.12/203.66 = 115.56/x
  3. Step 3: Cross multiply
    136.12x = 203.66 × 115.56
  4. Step 4: Simplify right side
    136.12x = 23,534.95
  5. Step 5: Solve for x
    x = 23,534.95/136.12
  6. Step 6: Final answer
    x = 172.90

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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.