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Finding the Fourth Proportional to 51.27, 76.81 and 31.95

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Solution

The fourth proportional to 51.27, 76.81 and 31.95 is: 47.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.27 : 76.81 = 31.95 : x
  2. Step 2: Convert to fraction form
    51.27/76.81 = 31.95/x
  3. Step 3: Cross multiply
    51.27x = 76.81 × 31.95
  4. Step 4: Simplify right side
    51.27x = 2,454.08
  5. Step 5: Solve for x
    x = 2,454.08/51.27
  6. Step 6: Final answer
    x = 47.87

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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.