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Finding the Fourth Proportional to 122.94, 169.61 and 86.15

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Solution

The fourth proportional to 122.94, 169.61 and 86.15 is: 118.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.94 : 169.61 = 86.15 : x
  2. Step 2: Convert to fraction form
    122.94/169.61 = 86.15/x
  3. Step 3: Cross multiply
    122.94x = 169.61 × 86.15
  4. Step 4: Simplify right side
    122.94x = 14,610.62
  5. Step 5: Solve for x
    x = 14,610.62/122.94
  6. Step 6: Final answer
    x = 118.84

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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.