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Finding the Fourth Proportional to 54.88, 81.61 and 54.68

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Solution

The fourth proportional to 54.88, 81.61 and 54.68 is: 81.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.88 : 81.61 = 54.68 : x
  2. Step 2: Convert to fraction form
    54.88/81.61 = 54.68/x
  3. Step 3: Cross multiply
    54.88x = 81.61 × 54.68
  4. Step 4: Simplify right side
    54.88x = 4,461.89
  5. Step 5: Solve for x
    x = 4,461.89/54.88
  6. Step 6: Final answer
    x = 81.31

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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.