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Finding the Fourth Proportional to 209.57, 289.10 and 122.18

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Solution

The fourth proportional to 209.57, 289.10 and 122.18 is: 168.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.57 : 289.10 = 122.18 : x
  2. Step 2: Convert to fraction form
    209.57/289.10 = 122.18/x
  3. Step 3: Cross multiply
    209.57x = 289.10 × 122.18
  4. Step 4: Simplify right side
    209.57x = 35,320.18
  5. Step 5: Solve for x
    x = 35,320.18/209.57
  6. Step 6: Final answer
    x = 168.54

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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.