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Finding the Fourth Proportional to 122.30, 183.20 and 76.66

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Solution

The fourth proportional to 122.30, 183.20 and 76.66 is: 114.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.30 : 183.20 = 76.66 : x
  2. Step 2: Convert to fraction form
    122.30/183.20 = 76.66/x
  3. Step 3: Cross multiply
    122.30x = 183.20 × 76.66
  4. Step 4: Simplify right side
    122.30x = 14,044.11
  5. Step 5: Solve for x
    x = 14,044.11/122.30
  6. Step 6: Final answer
    x = 114.83

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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.