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Finding the Fourth Proportional to 57.98, 86.49 and 54.81

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Solution

The fourth proportional to 57.98, 86.49 and 54.81 is: 81.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.98 : 86.49 = 54.81 : x
  2. Step 2: Convert to fraction form
    57.98/86.49 = 54.81/x
  3. Step 3: Cross multiply
    57.98x = 86.49 × 54.81
  4. Step 4: Simplify right side
    57.98x = 4,740.52
  5. Step 5: Solve for x
    x = 4,740.52/57.98
  6. Step 6: Final answer
    x = 81.76

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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.