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Finding the Fourth Proportional to 20,806.44, 28,712.99 and 11,375

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Solution

The fourth proportional to 20,806.44, 28,712.99 and 11,375 is: 15,697.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,806.44 : 28,712.99 = 11,375 : x
  2. Step 2: Convert to fraction form
    20,806.44/28,712.99 = 11,375/x
  3. Step 3: Cross multiply
    20,806.44x = 28,712.99 × 11,375
  4. Step 4: Simplify right side
    20,806.44x = 326,610,204.38
  5. Step 5: Solve for x
    x = 326,610,204.38/20,806.44
  6. Step 6: Final answer
    x = 15,697.55

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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.