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Finding the Fourth Proportional to 121.09, 167.11 and 68.63

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Solution

The fourth proportional to 121.09, 167.11 and 68.63 is: 94.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.09 : 167.11 = 68.63 : x
  2. Step 2: Convert to fraction form
    121.09/167.11 = 68.63/x
  3. Step 3: Cross multiply
    121.09x = 167.11 × 68.63
  4. Step 4: Simplify right side
    121.09x = 11,469.55
  5. Step 5: Solve for x
    x = 11,469.55/121.09
  6. Step 6: Final answer
    x = 94.72

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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.