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Finding the Fourth Proportional to 136.91, 204.49 and 121.79

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Solution

The fourth proportional to 136.91, 204.49 and 121.79 is: 181.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.91 : 204.49 = 121.79 : x
  2. Step 2: Convert to fraction form
    136.91/204.49 = 121.79/x
  3. Step 3: Cross multiply
    136.91x = 204.49 × 121.79
  4. Step 4: Simplify right side
    136.91x = 24,904.84
  5. Step 5: Solve for x
    x = 24,904.84/136.91
  6. Step 6: Final answer
    x = 181.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.