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Finding the Fourth Proportional to 80.42, 110.90 and 52.80

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Solution

The fourth proportional to 80.42, 110.90 and 52.80 is: 72.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.42 : 110.90 = 52.80 : x
  2. Step 2: Convert to fraction form
    80.42/110.90 = 52.80/x
  3. Step 3: Cross multiply
    80.42x = 110.90 × 52.80
  4. Step 4: Simplify right side
    80.42x = 5,855.26
  5. Step 5: Solve for x
    x = 5,855.26/80.42
  6. Step 6: Final answer
    x = 72.81

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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.