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Finding the Fourth Proportional to 136.05, 187.78 and 122.21

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Solution

The fourth proportional to 136.05, 187.78 and 122.21 is: 168.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.05 : 187.78 = 122.21 : x
  2. Step 2: Convert to fraction form
    136.05/187.78 = 122.21/x
  3. Step 3: Cross multiply
    136.05x = 187.78 × 122.21
  4. Step 4: Simplify right side
    136.05x = 22,948.90
  5. Step 5: Solve for x
    x = 22,948.90/136.05
  6. Step 6: Final answer
    x = 168.68

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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.