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Finding the Fourth Proportional to 209.72, 289.43 and 122.42

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Solution

The fourth proportional to 209.72, 289.43 and 122.42 is: 168.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.72 : 289.43 = 122.42 : x
  2. Step 2: Convert to fraction form
    209.72/289.43 = 122.42/x
  3. Step 3: Cross multiply
    209.72x = 289.43 × 122.42
  4. Step 4: Simplify right side
    209.72x = 35,432.02
  5. Step 5: Solve for x
    x = 35,432.02/209.72
  6. Step 6: Final answer
    x = 168.95

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.