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Finding the Fourth Proportional to 81.09, 111.59 and 73.33

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Solution

The fourth proportional to 81.09, 111.59 and 73.33 is: 100.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.09 : 111.59 = 73.33 : x
  2. Step 2: Convert to fraction form
    81.09/111.59 = 73.33/x
  3. Step 3: Cross multiply
    81.09x = 111.59 × 73.33
  4. Step 4: Simplify right side
    81.09x = 8,182.53
  5. Step 5: Solve for x
    x = 8,182.53/81.09
  6. Step 6: Final answer
    x = 100.90

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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.