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Finding the Fourth Proportional to 122.57, 183.88 and 45.55

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Solution

The fourth proportional to 122.57, 183.88 and 45.55 is: 68.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.57 : 183.88 = 45.55 : x
  2. Step 2: Convert to fraction form
    122.57/183.88 = 45.55/x
  3. Step 3: Cross multiply
    122.57x = 183.88 × 45.55
  4. Step 4: Simplify right side
    122.57x = 8,375.16
  5. Step 5: Solve for x
    x = 8,375.16/122.57
  6. Step 6: Final answer
    x = 68.33

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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.