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Finding the Fourth Proportional to 96.81, 133.59 and 63.61

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Solution

The fourth proportional to 96.81, 133.59 and 63.61 is: 87.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.81 : 133.59 = 63.61 : x
  2. Step 2: Convert to fraction form
    96.81/133.59 = 63.61/x
  3. Step 3: Cross multiply
    96.81x = 133.59 × 63.61
  4. Step 4: Simplify right side
    96.81x = 8,497.66
  5. Step 5: Solve for x
    x = 8,497.66/96.81
  6. Step 6: Final answer
    x = 87.78

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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.