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Finding the Fourth Proportional to 209.46, 289.08 and 122.13

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Solution

The fourth proportional to 209.46, 289.08 and 122.13 is: 168.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.46 : 289.08 = 122.13 : x
  2. Step 2: Convert to fraction form
    209.46/289.08 = 122.13/x
  3. Step 3: Cross multiply
    209.46x = 289.08 × 122.13
  4. Step 4: Simplify right side
    209.46x = 35,305.34
  5. Step 5: Solve for x
    x = 35,305.34/209.46
  6. Step 6: Final answer
    x = 168.55

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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.