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Finding the Fourth Proportional to 54.35, 80.90 and 51.71

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Solution

The fourth proportional to 54.35, 80.90 and 51.71 is: 76.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.35 : 80.90 = 51.71 : x
  2. Step 2: Convert to fraction form
    54.35/80.90 = 51.71/x
  3. Step 3: Cross multiply
    54.35x = 80.90 × 51.71
  4. Step 4: Simplify right side
    54.35x = 4,183.67
  5. Step 5: Solve for x
    x = 4,183.67/54.35
  6. Step 6: Final answer
    x = 76.98

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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.