Home / 13,813.62-20,720.64-3,425.38

Finding the Fourth Proportional to 13,813.62, 20,720.64 and 3,425.38

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Solution

The fourth proportional to 13,813.62, 20,720.64 and 3,425.38 is: 5,138.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,813.62 : 20,720.64 = 3,425.38 : x
  2. Step 2: Convert to fraction form
    13,813.62/20,720.64 = 3,425.38/x
  3. Step 3: Cross multiply
    13,813.62x = 20,720.64 × 3,425.38
  4. Step 4: Simplify right side
    13,813.62x = 70,976,065.84
  5. Step 5: Solve for x
    x = 70,976,065.84/13,813.62
  6. Step 6: Final answer
    x = 5,138.12

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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.