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Finding the Fourth Proportional to 20,806.62, 28,713.12 and 11,375.17

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Solution

The fourth proportional to 20,806.62, 28,713.12 and 11,375.17 is: 15,697.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,806.62 : 28,713.12 = 11,375.17 : x
  2. Step 2: Convert to fraction form
    20,806.62/28,713.12 = 11,375.17/x
  3. Step 3: Cross multiply
    20,806.62x = 28,713.12 × 11,375.17
  4. Step 4: Simplify right side
    20,806.62x = 326,616,621.23
  5. Step 5: Solve for x
    x = 326,616,621.23/20,806.62
  6. Step 6: Final answer
    x = 15,697.73

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1.5x scale

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.