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Finding the Fourth Proportional to 131.22, 180.81 and 122.58

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Solution

The fourth proportional to 131.22, 180.81 and 122.58 is: 168.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.22 : 180.81 = 122.58 : x
  2. Step 2: Convert to fraction form
    131.22/180.81 = 122.58/x
  3. Step 3: Cross multiply
    131.22x = 180.81 × 122.58
  4. Step 4: Simplify right side
    131.22x = 22,163.69
  5. Step 5: Solve for x
    x = 22,163.69/131.22
  6. Step 6: Final answer
    x = 168.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.