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Finding the Fourth Proportional to 68.56, 102.81 and 25.21

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Solution

The fourth proportional to 68.56, 102.81 and 25.21 is: 37.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.56 : 102.81 = 25.21 : x
  2. Step 2: Convert to fraction form
    68.56/102.81 = 25.21/x
  3. Step 3: Cross multiply
    68.56x = 102.81 × 25.21
  4. Step 4: Simplify right side
    68.56x = 2,591.97
  5. Step 5: Solve for x
    x = 2,591.97/68.56
  6. Step 6: Final answer
    x = 37.81

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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.