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Finding the Fourth Proportional to 83.48, 115.28 and 80.44

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Solution

The fourth proportional to 83.48, 115.28 and 80.44 is: 111.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.48 : 115.28 = 80.44 : x
  2. Step 2: Convert to fraction form
    83.48/115.28 = 80.44/x
  3. Step 3: Cross multiply
    83.48x = 115.28 × 80.44
  4. Step 4: Simplify right side
    83.48x = 9,273.12
  5. Step 5: Solve for x
    x = 9,273.12/83.48
  6. Step 6: Final answer
    x = 111.08

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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.