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Finding the Fourth Proportional to 25,781, 38,671.72 and 10,198.60

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Solution

The fourth proportional to 25,781, 38,671.72 and 10,198.60 is: 15,297.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,781 : 38,671.72 = 10,198.60 : x
  2. Step 2: Convert to fraction form
    25,781/38,671.72 = 10,198.60/x
  3. Step 3: Cross multiply
    25,781x = 38,671.72 × 10,198.60
  4. Step 4: Simplify right side
    25,781x = 394,397,403.59
  5. Step 5: Solve for x
    x = 394,397,403.59/25,781
  6. Step 6: Final answer
    x = 15,297.99

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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.