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Finding the Fourth Proportional to 54.75, 81.94 and 31.92

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Solution

The fourth proportional to 54.75, 81.94 and 31.92 is: 47.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.75 : 81.94 = 31.92 : x
  2. Step 2: Convert to fraction form
    54.75/81.94 = 31.92/x
  3. Step 3: Cross multiply
    54.75x = 81.94 × 31.92
  4. Step 4: Simplify right side
    54.75x = 2,615.52
  5. Step 5: Solve for x
    x = 2,615.52/54.75
  6. Step 6: Final answer
    x = 47.77

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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.