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Finding the Fourth Proportional to 80.81, 111.60 and 61.37

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Solution

The fourth proportional to 80.81, 111.60 and 61.37 is: 84.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.81 : 111.60 = 61.37 : x
  2. Step 2: Convert to fraction form
    80.81/111.60 = 61.37/x
  3. Step 3: Cross multiply
    80.81x = 111.60 × 61.37
  4. Step 4: Simplify right side
    80.81x = 6,848.89
  5. Step 5: Solve for x
    x = 6,848.89/80.81
  6. Step 6: Final answer
    x = 84.75

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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.