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Finding the Fourth Proportional to 86.68, 129.25 and 82.27

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Solution

The fourth proportional to 86.68, 129.25 and 82.27 is: 122.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.68 : 129.25 = 82.27 : x
  2. Step 2: Convert to fraction form
    86.68/129.25 = 82.27/x
  3. Step 3: Cross multiply
    86.68x = 129.25 × 82.27
  4. Step 4: Simplify right side
    86.68x = 10,633.40
  5. Step 5: Solve for x
    x = 10,633.40/86.68
  6. Step 6: Final answer
    x = 122.67

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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.