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Finding the Fourth Proportional to 79.89, 109.81 and 67.43

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Solution

The fourth proportional to 79.89, 109.81 and 67.43 is: 92.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.89 : 109.81 = 67.43 : x
  2. Step 2: Convert to fraction form
    79.89/109.81 = 67.43/x
  3. Step 3: Cross multiply
    79.89x = 109.81 × 67.43
  4. Step 4: Simplify right side
    79.89x = 7,404.47
  5. Step 5: Solve for x
    x = 7,404.47/79.89
  6. Step 6: Final answer
    x = 92.69

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.