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Finding the Fourth Proportional to 80.38, 111.12 and 76.98

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Solution

The fourth proportional to 80.38, 111.12 and 76.98 is: 106.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.38 : 111.12 = 76.98 : x
  2. Step 2: Convert to fraction form
    80.38/111.12 = 76.98/x
  3. Step 3: Cross multiply
    80.38x = 111.12 × 76.98
  4. Step 4: Simplify right side
    80.38x = 8,554.02
  5. Step 5: Solve for x
    x = 8,554.02/80.38
  6. Step 6: Final answer
    x = 106.42

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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.