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Finding the Fourth Proportional to 81.14, 111.97 and 47.94

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Solution

The fourth proportional to 81.14, 111.97 and 47.94 is: 66.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.14 : 111.97 = 47.94 : x
  2. Step 2: Convert to fraction form
    81.14/111.97 = 47.94/x
  3. Step 3: Cross multiply
    81.14x = 111.97 × 47.94
  4. Step 4: Simplify right side
    81.14x = 5,368.12
  5. Step 5: Solve for x
    x = 5,368.12/81.14
  6. Step 6: Final answer
    x = 66.16

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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.