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Finding the Fourth Proportional to 122.57, 167.64 and 120.68

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Solution

The fourth proportional to 122.57, 167.64 and 120.68 is: 165.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.57 : 167.64 = 120.68 : x
  2. Step 2: Convert to fraction form
    122.57/167.64 = 120.68/x
  3. Step 3: Cross multiply
    122.57x = 167.64 × 120.68
  4. Step 4: Simplify right side
    122.57x = 20,229.96
  5. Step 5: Solve for x
    x = 20,229.96/122.57
  6. Step 6: Final answer
    x = 165.05

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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.