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Finding the Fourth Proportional to 80.21, 110.72 and 49.13

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Solution

The fourth proportional to 80.21, 110.72 and 49.13 is: 67.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.21 : 110.72 = 49.13 : x
  2. Step 2: Convert to fraction form
    80.21/110.72 = 49.13/x
  3. Step 3: Cross multiply
    80.21x = 110.72 × 49.13
  4. Step 4: Simplify right side
    80.21x = 5,439.67
  5. Step 5: Solve for x
    x = 5,439.67/80.21
  6. Step 6: Final answer
    x = 67.82

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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.