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Finding the Fourth Proportional to 122.05, 168.43 and 66.79

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Solution

The fourth proportional to 122.05, 168.43 and 66.79 is: 92.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.05 : 168.43 = 66.79 : x
  2. Step 2: Convert to fraction form
    122.05/168.43 = 66.79/x
  3. Step 3: Cross multiply
    122.05x = 168.43 × 66.79
  4. Step 4: Simplify right side
    122.05x = 11,248.66
  5. Step 5: Solve for x
    x = 11,248.66/122.05
  6. Step 6: Final answer
    x = 92.17

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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.