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Finding the Fourth Proportional to 25.84, 38.90 and 19.12

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Solution

The fourth proportional to 25.84, 38.90 and 19.12 is: 28.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.84 : 38.90 = 19.12 : x
  2. Step 2: Convert to fraction form
    25.84/38.90 = 19.12/x
  3. Step 3: Cross multiply
    25.84x = 38.90 × 19.12
  4. Step 4: Simplify right side
    25.84x = 743.58
  5. Step 5: Solve for x
    x = 743.58/25.84
  6. Step 6: Final answer
    x = 28.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.