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Finding the Fourth Proportional to 136.37, 203.60 and 115.79

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Solution

The fourth proportional to 136.37, 203.60 and 115.79 is: 172.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.37 : 203.60 = 115.79 : x
  2. Step 2: Convert to fraction form
    136.37/203.60 = 115.79/x
  3. Step 3: Cross multiply
    136.37x = 203.60 × 115.79
  4. Step 4: Simplify right side
    136.37x = 23,573.25
  5. Step 5: Solve for x
    x = 23,573.25/136.37
  6. Step 6: Final answer
    x = 172.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.