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Finding the Fourth Proportional to 20,806.96, 28,713 and 11,375.32

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Solution

The fourth proportional to 20,806.96, 28,713 and 11,375.32 is: 15,697.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,806.96 : 28,713 = 11,375.32 : x
  2. Step 2: Convert to fraction form
    20,806.96/28,713 = 11,375.32/x
  3. Step 3: Cross multiply
    20,806.96x = 28,713 × 11,375.32
  4. Step 4: Simplify right side
    20,806.96x = 326,619,563.16
  5. Step 5: Solve for x
    x = 326,619,563.16/20,806.96
  6. Step 6: Final answer
    x = 15,697.61

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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.