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Finding the Fourth Proportional to 122.85, 184.41 and 84.38

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Solution

The fourth proportional to 122.85, 184.41 and 84.38 is: 126.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.85 : 184.41 = 84.38 : x
  2. Step 2: Convert to fraction form
    122.85/184.41 = 84.38/x
  3. Step 3: Cross multiply
    122.85x = 184.41 × 84.38
  4. Step 4: Simplify right side
    122.85x = 15,559.59
  5. Step 5: Solve for x
    x = 15,559.59/122.85
  6. Step 6: Final answer
    x = 126.66

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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.