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Finding the Fourth Proportional to 122.47, 183.49 and 83.90

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Solution

The fourth proportional to 122.47, 183.49 and 83.90 is: 125.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.47 : 183.49 = 83.90 : x
  2. Step 2: Convert to fraction form
    122.47/183.49 = 83.90/x
  3. Step 3: Cross multiply
    122.47x = 183.49 × 83.90
  4. Step 4: Simplify right side
    122.47x = 15,395.06
  5. Step 5: Solve for x
    x = 15,395.06/122.47
  6. Step 6: Final answer
    x = 125.71

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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.