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Finding the Fourth Proportional to 136.72, 205.24 and 121.52

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Solution

The fourth proportional to 136.72, 205.24 and 121.52 is: 182.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.72 : 205.24 = 121.52 : x
  2. Step 2: Convert to fraction form
    136.72/205.24 = 121.52/x
  3. Step 3: Cross multiply
    136.72x = 205.24 × 121.52
  4. Step 4: Simplify right side
    136.72x = 24,940.76
  5. Step 5: Solve for x
    x = 24,940.76/136.72
  6. Step 6: Final answer
    x = 182.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.