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Finding the Fourth Proportional to 121.93, 168.27 and 66.67

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Solution

The fourth proportional to 121.93, 168.27 and 66.67 is: 92.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.93 : 168.27 = 66.67 : x
  2. Step 2: Convert to fraction form
    121.93/168.27 = 66.67/x
  3. Step 3: Cross multiply
    121.93x = 168.27 × 66.67
  4. Step 4: Simplify right side
    121.93x = 11,218.98
  5. Step 5: Solve for x
    x = 11,218.98/121.93
  6. Step 6: Final answer
    x = 92.01

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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.