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Finding the Fourth Proportional to 13,815.11, 20,697.89 and 8,395.62

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Solution

The fourth proportional to 13,815.11, 20,697.89 and 8,395.62 is: 12,578.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,815.11 : 20,697.89 = 8,395.62 : x
  2. Step 2: Convert to fraction form
    13,815.11/20,697.89 = 8,395.62/x
  3. Step 3: Cross multiply
    13,815.11x = 20,697.89 × 8,395.62
  4. Step 4: Simplify right side
    13,815.11x = 173,771,619.24
  5. Step 5: Solve for x
    x = 173,771,619.24/13,815.11
  6. Step 6: Final answer
    x = 12,578.37

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1.5x scale

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.