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Finding the Fourth Proportional to 122.62, 183.94 and 90.76

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Solution

The fourth proportional to 122.62, 183.94 and 90.76 is: 136.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.62 : 183.94 = 90.76 : x
  2. Step 2: Convert to fraction form
    122.62/183.94 = 90.76/x
  3. Step 3: Cross multiply
    122.62x = 183.94 × 90.76
  4. Step 4: Simplify right side
    122.62x = 16,694.39
  5. Step 5: Solve for x
    x = 16,694.39/122.62
  6. Step 6: Final answer
    x = 136.15

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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.