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Finding the Fourth Proportional to 86.91, 131.15 and 82.96

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Solution

The fourth proportional to 86.91, 131.15 and 82.96 is: 125.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.91 : 131.15 = 82.96 : x
  2. Step 2: Convert to fraction form
    86.91/131.15 = 82.96/x
  3. Step 3: Cross multiply
    86.91x = 131.15 × 82.96
  4. Step 4: Simplify right side
    86.91x = 10,880.08
  5. Step 5: Solve for x
    x = 10,880.08/86.91
  6. Step 6: Final answer
    x = 125.19

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.