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Finding the Fourth Proportional to 80.55, 111.06 and 69.48

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Solution

The fourth proportional to 80.55, 111.06 and 69.48 is: 95.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.55 : 111.06 = 69.48 : x
  2. Step 2: Convert to fraction form
    80.55/111.06 = 69.48/x
  3. Step 3: Cross multiply
    80.55x = 111.06 × 69.48
  4. Step 4: Simplify right side
    80.55x = 7,716.45
  5. Step 5: Solve for x
    x = 7,716.45/80.55
  6. Step 6: Final answer
    x = 95.80

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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.