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Finding the Fourth Proportional to 95.72, 131.96 and 81

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Solution

The fourth proportional to 95.72, 131.96 and 81 is: 111.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.72 : 131.96 = 81 : x
  2. Step 2: Convert to fraction form
    95.72/131.96 = 81/x
  3. Step 3: Cross multiply
    95.72x = 131.96 × 81
  4. Step 4: Simplify right side
    95.72x = 10,688.76
  5. Step 5: Solve for x
    x = 10,688.76/95.72
  6. Step 6: Final answer
    x = 111.67

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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.