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Finding the Fourth Proportional to 81.25, 111.99 and 54.97

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Solution

The fourth proportional to 81.25, 111.99 and 54.97 is: 75.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.25 : 111.99 = 54.97 : x
  2. Step 2: Convert to fraction form
    81.25/111.99 = 54.97/x
  3. Step 3: Cross multiply
    81.25x = 111.99 × 54.97
  4. Step 4: Simplify right side
    81.25x = 6,155.53
  5. Step 5: Solve for x
    x = 6,155.53/81.25
  6. Step 6: Final answer
    x = 75.77

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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.