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Finding the Fourth Proportional to 136.25, 187.97 and 89

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Solution

The fourth proportional to 136.25, 187.97 and 89 is: 122.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.25 : 187.97 = 89 : x
  2. Step 2: Convert to fraction form
    136.25/187.97 = 89/x
  3. Step 3: Cross multiply
    136.25x = 187.97 × 89
  4. Step 4: Simplify right side
    136.25x = 16,729.33
  5. Step 5: Solve for x
    x = 16,729.33/136.25
  6. Step 6: Final answer
    x = 122.78

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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.