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Finding the Fourth Proportional to 54.63, 81.90 and 38.61

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Solution

The fourth proportional to 54.63, 81.90 and 38.61 is: 57.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.63 : 81.90 = 38.61 : x
  2. Step 2: Convert to fraction form
    54.63/81.90 = 38.61/x
  3. Step 3: Cross multiply
    54.63x = 81.90 × 38.61
  4. Step 4: Simplify right side
    54.63x = 3,162.16
  5. Step 5: Solve for x
    x = 3,162.16/54.63
  6. Step 6: Final answer
    x = 57.88

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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.