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Finding the Fourth Proportional to 121.75, 168.01 and 66.48

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Solution

The fourth proportional to 121.75, 168.01 and 66.48 is: 91.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.75 : 168.01 = 66.48 : x
  2. Step 2: Convert to fraction form
    121.75/168.01 = 66.48/x
  3. Step 3: Cross multiply
    121.75x = 168.01 × 66.48
  4. Step 4: Simplify right side
    121.75x = 11,169.77
  5. Step 5: Solve for x
    x = 11,169.77/121.75
  6. Step 6: Final answer
    x = 91.75

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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.