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Finding the Fourth Proportional to 122.93, 169.57 and 86.18

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Solution

The fourth proportional to 122.93, 169.57 and 86.18 is: 118.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.93 : 169.57 = 86.18 : x
  2. Step 2: Convert to fraction form
    122.93/169.57 = 86.18/x
  3. Step 3: Cross multiply
    122.93x = 169.57 × 86.18
  4. Step 4: Simplify right side
    122.93x = 14,613.54
  5. Step 5: Solve for x
    x = 14,613.54/122.93
  6. Step 6: Final answer
    x = 118.88

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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.