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Finding the Fourth Proportional to 122.91, 169.62 and 67.66

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Solution

The fourth proportional to 122.91, 169.62 and 67.66 is: 93.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.91 : 169.62 = 67.66 : x
  2. Step 2: Convert to fraction form
    122.91/169.62 = 67.66/x
  3. Step 3: Cross multiply
    122.91x = 169.62 × 67.66
  4. Step 4: Simplify right side
    122.91x = 11,475.64
  5. Step 5: Solve for x
    x = 11,475.64/122.91
  6. Step 6: Final answer
    x = 93.37

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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.