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Finding the Fourth Proportional to 122.42, 183.65 and 81.29

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Solution

The fourth proportional to 122.42, 183.65 and 81.29 is: 121.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.42 : 183.65 = 81.29 : x
  2. Step 2: Convert to fraction form
    122.42/183.65 = 81.29/x
  3. Step 3: Cross multiply
    122.42x = 183.65 × 81.29
  4. Step 4: Simplify right side
    122.42x = 14,927.58
  5. Step 5: Solve for x
    x = 14,927.58/122.42
  6. Step 6: Final answer
    x = 121.94

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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.