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Finding the Fourth Proportional to 15,139, 20,891.82 and 8,515

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Solution

The fourth proportional to 15,139, 20,891.82 and 8,515 is: 11,750.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,139 : 20,891.82 = 8,515 : x
  2. Step 2: Convert to fraction form
    15,139/20,891.82 = 8,515/x
  3. Step 3: Cross multiply
    15,139x = 20,891.82 × 8,515
  4. Step 4: Simplify right side
    15,139x = 177,893,847.30
  5. Step 5: Solve for x
    x = 177,893,847.30/15,139
  6. Step 6: Final answer
    x = 11,750.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.