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Finding the Fourth Proportional to 122.89, 183.20 and 115.99

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Solution

The fourth proportional to 122.89, 183.20 and 115.99 is: 172.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.89 : 183.20 = 115.99 : x
  2. Step 2: Convert to fraction form
    122.89/183.20 = 115.99/x
  3. Step 3: Cross multiply
    122.89x = 183.20 × 115.99
  4. Step 4: Simplify right side
    122.89x = 21,249.37
  5. Step 5: Solve for x
    x = 21,249.37/122.89
  6. Step 6: Final answer
    x = 172.91

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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.