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Finding the Fourth Proportional to 209.82, 289.17 and 136.11

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Solution

The fourth proportional to 209.82, 289.17 and 136.11 is: 187.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.82 : 289.17 = 136.11 : x
  2. Step 2: Convert to fraction form
    209.82/289.17 = 136.11/x
  3. Step 3: Cross multiply
    209.82x = 289.17 × 136.11
  4. Step 4: Simplify right side
    209.82x = 39,358.93
  5. Step 5: Solve for x
    x = 39,358.93/209.82
  6. Step 6: Final answer
    x = 187.58

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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.