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Finding the Fourth Proportional to 122.68, 183.92 and 86.64

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Solution

The fourth proportional to 122.68, 183.92 and 86.64 is: 129.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.68 : 183.92 = 86.64 : x
  2. Step 2: Convert to fraction form
    122.68/183.92 = 86.64/x
  3. Step 3: Cross multiply
    122.68x = 183.92 × 86.64
  4. Step 4: Simplify right side
    122.68x = 15,934.19
  5. Step 5: Solve for x
    x = 15,934.19/122.68
  6. Step 6: Final answer
    x = 129.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.