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Finding the Fourth Proportional to 209.72, 289.38 and 122.36

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Solution

The fourth proportional to 209.72, 289.38 and 122.36 is: 168.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.72 : 289.38 = 122.36 : x
  2. Step 2: Convert to fraction form
    209.72/289.38 = 122.36/x
  3. Step 3: Cross multiply
    209.72x = 289.38 × 122.36
  4. Step 4: Simplify right side
    209.72x = 35,408.54
  5. Step 5: Solve for x
    x = 35,408.54/209.72
  6. Step 6: Final answer
    x = 168.84

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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.