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Finding the Fourth Proportional to 81.51, 111.67 and 80.37

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Solution

The fourth proportional to 81.51, 111.67 and 80.37 is: 110.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.51 : 111.67 = 80.37 : x
  2. Step 2: Convert to fraction form
    81.51/111.67 = 80.37/x
  3. Step 3: Cross multiply
    81.51x = 111.67 × 80.37
  4. Step 4: Simplify right side
    81.51x = 8,974.63
  5. Step 5: Solve for x
    x = 8,974.63/81.51
  6. Step 6: Final answer
    x = 110.11

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.