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Finding the Fourth Proportional to 209.97, 289.76 and 122.67

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Solution

The fourth proportional to 209.97, 289.76 and 122.67 is: 169.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.97 : 289.76 = 122.67 : x
  2. Step 2: Convert to fraction form
    209.97/289.76 = 122.67/x
  3. Step 3: Cross multiply
    209.97x = 289.76 × 122.67
  4. Step 4: Simplify right side
    209.97x = 35,544.25
  5. Step 5: Solve for x
    x = 35,544.25/209.97
  6. Step 6: Final answer
    x = 169.28

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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.