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Finding the Fourth Proportional to 122.72, 183.87 and 68.49

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Solution

The fourth proportional to 122.72, 183.87 and 68.49 is: 102.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.72 : 183.87 = 68.49 : x
  2. Step 2: Convert to fraction form
    122.72/183.87 = 68.49/x
  3. Step 3: Cross multiply
    122.72x = 183.87 × 68.49
  4. Step 4: Simplify right side
    122.72x = 12,593.26
  5. Step 5: Solve for x
    x = 12,593.26/122.72
  6. Step 6: Final answer
    x = 102.62

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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.