Home / 13,813.87-20,720.78-3,425.62

Finding the Fourth Proportional to 13,813.87, 20,720.78 and 3,425.62

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Solution

The fourth proportional to 13,813.87, 20,720.78 and 3,425.62 is: 5,138.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,813.87 : 20,720.78 = 3,425.62 : x
  2. Step 2: Convert to fraction form
    13,813.87/20,720.78 = 3,425.62/x
  3. Step 3: Cross multiply
    13,813.87x = 20,720.78 × 3,425.62
  4. Step 4: Simplify right side
    13,813.87x = 70,981,397.65
  5. Step 5: Solve for x
    x = 70,981,397.65/13,813.87
  6. Step 6: Final answer
    x = 5,138.42

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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.