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Finding the Fourth Proportional to 86.91, 129.46 and 82.25

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Solution

The fourth proportional to 86.91, 129.46 and 82.25 is: 122.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.91 : 129.46 = 82.25 : x
  2. Step 2: Convert to fraction form
    86.91/129.46 = 82.25/x
  3. Step 3: Cross multiply
    86.91x = 129.46 × 82.25
  4. Step 4: Simplify right side
    86.91x = 10,648.09
  5. Step 5: Solve for x
    x = 10,648.09/86.91
  6. Step 6: Final answer
    x = 122.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.