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Finding the Fourth Proportional to 122.74, 183.90 and 81.58

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Solution

The fourth proportional to 122.74, 183.90 and 81.58 is: 122.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.74 : 183.90 = 81.58 : x
  2. Step 2: Convert to fraction form
    122.74/183.90 = 81.58/x
  3. Step 3: Cross multiply
    122.74x = 183.90 × 81.58
  4. Step 4: Simplify right side
    122.74x = 15,002.56
  5. Step 5: Solve for x
    x = 15,002.56/122.74
  6. Step 6: Final answer
    x = 122.23

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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.