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Finding the Fourth Proportional to 209.50, 289.11 and 122.16

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Solution

The fourth proportional to 209.50, 289.11 and 122.16 is: 168.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.50 : 289.11 = 122.16 : x
  2. Step 2: Convert to fraction form
    209.50/289.11 = 122.16/x
  3. Step 3: Cross multiply
    209.50x = 289.11 × 122.16
  4. Step 4: Simplify right side
    209.50x = 35,316.23
  5. Step 5: Solve for x
    x = 35,316.23/209.50
  6. Step 6: Final answer
    x = 168.57

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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.