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Finding the Fourth Proportional to 209.55, 289.22 and 122.27

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Solution

The fourth proportional to 209.55, 289.22 and 122.27 is: 168.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.55 : 289.22 = 122.27 : x
  2. Step 2: Convert to fraction form
    209.55/289.22 = 122.27/x
  3. Step 3: Cross multiply
    209.55x = 289.22 × 122.27
  4. Step 4: Simplify right side
    209.55x = 35,362.93
  5. Step 5: Solve for x
    x = 35,362.93/209.55
  6. Step 6: Final answer
    x = 168.76

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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.