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Finding the Fourth Proportional to 96.65, 133.32 and 81.18

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Solution

The fourth proportional to 96.65, 133.32 and 81.18 is: 111.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.65 : 133.32 = 81.18 : x
  2. Step 2: Convert to fraction form
    96.65/133.32 = 81.18/x
  3. Step 3: Cross multiply
    96.65x = 133.32 × 81.18
  4. Step 4: Simplify right side
    96.65x = 10,822.92
  5. Step 5: Solve for x
    x = 10,822.92/96.65
  6. Step 6: Final answer
    x = 111.99

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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.