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Finding the Fourth Proportional to 98.94, 136.71 and 81.66

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Solution

The fourth proportional to 98.94, 136.71 and 81.66 is: 112.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.94 : 136.71 = 81.66 : x
  2. Step 2: Convert to fraction form
    98.94/136.71 = 81.66/x
  3. Step 3: Cross multiply
    98.94x = 136.71 × 81.66
  4. Step 4: Simplify right side
    98.94x = 11,163.74
  5. Step 5: Solve for x
    x = 11,163.74/98.94
  6. Step 6: Final answer
    x = 112.83

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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.