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Finding the Fourth Proportional to 39.81, 55.27 and 38.86

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Solution

The fourth proportional to 39.81, 55.27 and 38.86 is: 53.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.81 : 55.27 = 38.86 : x
  2. Step 2: Convert to fraction form
    39.81/55.27 = 38.86/x
  3. Step 3: Cross multiply
    39.81x = 55.27 × 38.86
  4. Step 4: Simplify right side
    39.81x = 2,147.79
  5. Step 5: Solve for x
    x = 2,147.79/39.81
  6. Step 6: Final answer
    x = 53.95

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.