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Finding the Fourth Proportional to 25.64, 38.42 and 19.92

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Solution

The fourth proportional to 25.64, 38.42 and 19.92 is: 29.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.64 : 38.42 = 19.92 : x
  2. Step 2: Convert to fraction form
    25.64/38.42 = 19.92/x
  3. Step 3: Cross multiply
    25.64x = 38.42 × 19.92
  4. Step 4: Simplify right side
    25.64x = 765.33
  5. Step 5: Solve for x
    x = 765.33/25.64
  6. Step 6: Final answer
    x = 29.85

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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.