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Finding the Fourth Proportional to 51.22, 76.81 and 25.55

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Solution

The fourth proportional to 51.22, 76.81 and 25.55 is: 38.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.22 : 76.81 = 25.55 : x
  2. Step 2: Convert to fraction form
    51.22/76.81 = 25.55/x
  3. Step 3: Cross multiply
    51.22x = 76.81 × 25.55
  4. Step 4: Simplify right side
    51.22x = 1,962.37
  5. Step 5: Solve for x
    x = 1,962.37/51.22
  6. Step 6: Final answer
    x = 38.31

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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.