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Finding the Fourth Proportional to 122.07, 168.45 and 66.81

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Solution

The fourth proportional to 122.07, 168.45 and 66.81 is: 92.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.07 : 168.45 = 66.81 : x
  2. Step 2: Convert to fraction form
    122.07/168.45 = 66.81/x
  3. Step 3: Cross multiply
    122.07x = 168.45 × 66.81
  4. Step 4: Simplify right side
    122.07x = 11,253.72
  5. Step 5: Solve for x
    x = 11,253.72/122.07
  6. Step 6: Final answer
    x = 92.19

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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.