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Finding the Fourth Proportional to 80.85, 121.21 and 35.22

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Solution

The fourth proportional to 80.85, 121.21 and 35.22 is: 52.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.85 : 121.21 = 35.22 : x
  2. Step 2: Convert to fraction form
    80.85/121.21 = 35.22/x
  3. Step 3: Cross multiply
    80.85x = 121.21 × 35.22
  4. Step 4: Simplify right side
    80.85x = 4,269.02
  5. Step 5: Solve for x
    x = 4,269.02/80.85
  6. Step 6: Final answer
    x = 52.80

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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.