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Finding the Fourth Proportional to 54.75, 81.64 and 51.56

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Solution

The fourth proportional to 54.75, 81.64 and 51.56 is: 76.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.75 : 81.64 = 51.56 : x
  2. Step 2: Convert to fraction form
    54.75/81.64 = 51.56/x
  3. Step 3: Cross multiply
    54.75x = 81.64 × 51.56
  4. Step 4: Simplify right side
    54.75x = 4,208.95
  5. Step 5: Solve for x
    x = 4,208.95/54.75
  6. Step 6: Final answer
    x = 76.88

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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.