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Finding the Fourth Proportional to 80.21, 120.55 and 74.80

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Solution

The fourth proportional to 80.21, 120.55 and 74.80 is: 112.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.21 : 120.55 = 74.80 : x
  2. Step 2: Convert to fraction form
    80.21/120.55 = 74.80/x
  3. Step 3: Cross multiply
    80.21x = 120.55 × 74.80
  4. Step 4: Simplify right side
    80.21x = 9,016.36
  5. Step 5: Solve for x
    x = 9,016.36/80.21
  6. Step 6: Final answer
    x = 112.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.