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Finding the Fourth Proportional to 13,603.57, 20,404.40 and 3,608.09

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Solution

The fourth proportional to 13,603.57, 20,404.40 and 3,608.09 is: 5,411.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,603.57 : 20,404.40 = 3,608.09 : x
  2. Step 2: Convert to fraction form
    13,603.57/20,404.40 = 3,608.09/x
  3. Step 3: Cross multiply
    13,603.57x = 20,404.40 × 3,608.09
  4. Step 4: Simplify right side
    13,603.57x = 73,620,868.05
  5. Step 5: Solve for x
    x = 73,620,868.05/13,603.57
  6. Step 6: Final answer
    x = 5,411.88

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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.