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Finding the Fourth Proportional to 122.39, 183.28 and 115.71

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Solution

The fourth proportional to 122.39, 183.28 and 115.71 is: 173.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.39 : 183.28 = 115.71 : x
  2. Step 2: Convert to fraction form
    122.39/183.28 = 115.71/x
  3. Step 3: Cross multiply
    122.39x = 183.28 × 115.71
  4. Step 4: Simplify right side
    122.39x = 21,205.83
  5. Step 5: Solve for x
    x = 21,205.83/122.39
  6. Step 6: Final answer
    x = 173.26

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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.