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Finding the Fourth Proportional to 136.15, 187.72 and 115.09

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Solution

The fourth proportional to 136.15, 187.72 and 115.09 is: 158.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.15 : 187.72 = 115.09 : x
  2. Step 2: Convert to fraction form
    136.15/187.72 = 115.09/x
  3. Step 3: Cross multiply
    136.15x = 187.72 × 115.09
  4. Step 4: Simplify right side
    136.15x = 21,603.94
  5. Step 5: Solve for x
    x = 21,603.94/136.15
  6. Step 6: Final answer
    x = 158.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.