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Finding the Fourth Proportional to 122.22, 182.39 and 102.78

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Solution

The fourth proportional to 122.22, 182.39 and 102.78 is: 153.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.22 : 182.39 = 102.78 : x
  2. Step 2: Convert to fraction form
    122.22/182.39 = 102.78/x
  3. Step 3: Cross multiply
    122.22x = 182.39 × 102.78
  4. Step 4: Simplify right side
    122.22x = 18,745.53
  5. Step 5: Solve for x
    x = 18,745.53/122.22
  6. Step 6: Final answer
    x = 153.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.