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Finding the Fourth Proportional to 136.24, 188.20 and 121.68

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Solution

The fourth proportional to 136.24, 188.20 and 121.68 is: 168.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.24 : 188.20 = 121.68 : x
  2. Step 2: Convert to fraction form
    136.24/188.20 = 121.68/x
  3. Step 3: Cross multiply
    136.24x = 188.20 × 121.68
  4. Step 4: Simplify right side
    136.24x = 22,900.18
  5. Step 5: Solve for x
    x = 22,900.18/136.24
  6. Step 6: Final answer
    x = 168.09

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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.