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Finding the Fourth Proportional to 54.94, 82.43 and 31.85

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Solution

The fourth proportional to 54.94, 82.43 and 31.85 is: 47.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.94 : 82.43 = 31.85 : x
  2. Step 2: Convert to fraction form
    54.94/82.43 = 31.85/x
  3. Step 3: Cross multiply
    54.94x = 82.43 × 31.85
  4. Step 4: Simplify right side
    54.94x = 2,625.24
  5. Step 5: Solve for x
    x = 2,625.24/54.94
  6. Step 6: Final answer
    x = 47.79

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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.