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Finding the Fourth Proportional to 79.91, 109.89 and 73.38

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Solution

The fourth proportional to 79.91, 109.89 and 73.38 is: 100.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.91 : 109.89 = 73.38 : x
  2. Step 2: Convert to fraction form
    79.91/109.89 = 73.38/x
  3. Step 3: Cross multiply
    79.91x = 109.89 × 73.38
  4. Step 4: Simplify right side
    79.91x = 8,063.73
  5. Step 5: Solve for x
    x = 8,063.73/79.91
  6. Step 6: Final answer
    x = 100.91

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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.