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Finding the Fourth Proportional to 54.88, 81.96 and 47.68

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Solution

The fourth proportional to 54.88, 81.96 and 47.68 is: 71.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.88 : 81.96 = 47.68 : x
  2. Step 2: Convert to fraction form
    54.88/81.96 = 47.68/x
  3. Step 3: Cross multiply
    54.88x = 81.96 × 47.68
  4. Step 4: Simplify right side
    54.88x = 3,907.85
  5. Step 5: Solve for x
    x = 3,907.85/54.88
  6. Step 6: Final answer
    x = 71.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.