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Finding the Fourth Proportional to 122.85, 168.75 and 119.21

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Solution

The fourth proportional to 122.85, 168.75 and 119.21 is: 163.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.85 : 168.75 = 119.21 : x
  2. Step 2: Convert to fraction form
    122.85/168.75 = 119.21/x
  3. Step 3: Cross multiply
    122.85x = 168.75 × 119.21
  4. Step 4: Simplify right side
    122.85x = 20,115.84
  5. Step 5: Solve for x
    x = 20,115.84/122.85
  6. Step 6: Final answer
    x = 163.74

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.