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Finding the Fourth Proportional to 54.61, 81.81 and 31.79

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Solution

The fourth proportional to 54.61, 81.81 and 31.79 is: 47.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.61 : 81.81 = 31.79 : x
  2. Step 2: Convert to fraction form
    54.61/81.81 = 31.79/x
  3. Step 3: Cross multiply
    54.61x = 81.81 × 31.79
  4. Step 4: Simplify right side
    54.61x = 2,600.94
  5. Step 5: Solve for x
    x = 2,600.94/54.61
  6. Step 6: Final answer
    x = 47.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.