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Finding the Fourth Proportional to 131.11, 180.86 and 86.92

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Solution

The fourth proportional to 131.11, 180.86 and 86.92 is: 119.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.11 : 180.86 = 86.92 : x
  2. Step 2: Convert to fraction form
    131.11/180.86 = 86.92/x
  3. Step 3: Cross multiply
    131.11x = 180.86 × 86.92
  4. Step 4: Simplify right side
    131.11x = 15,720.35
  5. Step 5: Solve for x
    x = 15,720.35/131.11
  6. Step 6: Final answer
    x = 119.90

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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.