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Finding the Fourth Proportional to 80.21, 110.72 and 55.73

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Solution

The fourth proportional to 80.21, 110.72 and 55.73 is: 76.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.21 : 110.72 = 55.73 : x
  2. Step 2: Convert to fraction form
    80.21/110.72 = 55.73/x
  3. Step 3: Cross multiply
    80.21x = 110.72 × 55.73
  4. Step 4: Simplify right side
    80.21x = 6,170.43
  5. Step 5: Solve for x
    x = 6,170.43/80.21
  6. Step 6: Final answer
    x = 76.93

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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.