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Finding the Fourth Proportional to 79.98, 119.96 and 25.87

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Solution

The fourth proportional to 79.98, 119.96 and 25.87 is: 38.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.98 : 119.96 = 25.87 : x
  2. Step 2: Convert to fraction form
    79.98/119.96 = 25.87/x
  3. Step 3: Cross multiply
    79.98x = 119.96 × 25.87
  4. Step 4: Simplify right side
    79.98x = 3,103.37
  5. Step 5: Solve for x
    x = 3,103.37/79.98
  6. Step 6: Final answer
    x = 38.80

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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.