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Finding the Fourth Proportional to 80.37, 110.81 and 57.09

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Solution

The fourth proportional to 80.37, 110.81 and 57.09 is: 78.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.37 : 110.81 = 57.09 : x
  2. Step 2: Convert to fraction form
    80.37/110.81 = 57.09/x
  3. Step 3: Cross multiply
    80.37x = 110.81 × 57.09
  4. Step 4: Simplify right side
    80.37x = 6,326.14
  5. Step 5: Solve for x
    x = 6,326.14/80.37
  6. Step 6: Final answer
    x = 78.71

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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.