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Finding the Fourth Proportional to 122.61, 169.18 and 85.76

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Solution

The fourth proportional to 122.61, 169.18 and 85.76 is: 118.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.61 : 169.18 = 85.76 : x
  2. Step 2: Convert to fraction form
    122.61/169.18 = 85.76/x
  3. Step 3: Cross multiply
    122.61x = 169.18 × 85.76
  4. Step 4: Simplify right side
    122.61x = 14,508.88
  5. Step 5: Solve for x
    x = 14,508.88/122.61
  6. Step 6: Final answer
    x = 118.33

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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.