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Finding the Fourth Proportional to 54.75, 81.99 and 48.09

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Solution

The fourth proportional to 54.75, 81.99 and 48.09 is: 72.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.75 : 81.99 = 48.09 : x
  2. Step 2: Convert to fraction form
    54.75/81.99 = 48.09/x
  3. Step 3: Cross multiply
    54.75x = 81.99 × 48.09
  4. Step 4: Simplify right side
    54.75x = 3,942.90
  5. Step 5: Solve for x
    x = 3,942.90/54.75
  6. Step 6: Final answer
    x = 72.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.