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Finding the Fourth Proportional to 25,857.99, 38,787.83 and 7,139.43

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Solution

The fourth proportional to 25,857.99, 38,787.83 and 7,139.43 is: 10,709.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,857.99 : 38,787.83 = 7,139.43 : x
  2. Step 2: Convert to fraction form
    25,857.99/38,787.83 = 7,139.43/x
  3. Step 3: Cross multiply
    25,857.99x = 38,787.83 × 7,139.43
  4. Step 4: Simplify right side
    25,857.99x = 276,922,961.44
  5. Step 5: Solve for x
    x = 276,922,961.44/25,857.99
  6. Step 6: Final answer
    x = 10,709.38

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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.