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Finding the Fourth Proportional to 54.86, 81.87 and 48.80

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Solution

The fourth proportional to 54.86, 81.87 and 48.80 is: 72.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.86 : 81.87 = 48.80 : x
  2. Step 2: Convert to fraction form
    54.86/81.87 = 48.80/x
  3. Step 3: Cross multiply
    54.86x = 81.87 × 48.80
  4. Step 4: Simplify right side
    54.86x = 3,995.01
  5. Step 5: Solve for x
    x = 3,995.01/54.86
  6. Step 6: Final answer
    x = 72.82

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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.