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Finding the Fourth Proportional to 80.87, 111.62 and 67.10

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Solution

The fourth proportional to 80.87, 111.62 and 67.10 is: 92.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.87 : 111.62 = 67.10 : x
  2. Step 2: Convert to fraction form
    80.87/111.62 = 67.10/x
  3. Step 3: Cross multiply
    80.87x = 111.62 × 67.10
  4. Step 4: Simplify right side
    80.87x = 7,489.31
  5. Step 5: Solve for x
    x = 7,489.31/80.87
  6. Step 6: Final answer
    x = 92.61

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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.