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Finding the Fourth Proportional to 17,139.60, 25,709.40 and 10,578.60

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Solution

The fourth proportional to 17,139.60, 25,709.40 and 10,578.60 is: 15,867.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,139.60 : 25,709.40 = 10,578.60 : x
  2. Step 2: Convert to fraction form
    17,139.60/25,709.40 = 10,578.60/x
  3. Step 3: Cross multiply
    17,139.60x = 25,709.40 × 10,578.60
  4. Step 4: Simplify right side
    17,139.60x = 271,969,458.84
  5. Step 5: Solve for x
    x = 271,969,458.84/17,139.60
  6. Step 6: Final answer
    x = 15,867.90

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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.