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Finding the Fourth Proportional to 13,379.82, 20,063.91 and 7,138.45

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Solution

The fourth proportional to 13,379.82, 20,063.91 and 7,138.45 is: 10,704.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,379.82 : 20,063.91 = 7,138.45 : x
  2. Step 2: Convert to fraction form
    13,379.82/20,063.91 = 7,138.45/x
  3. Step 3: Cross multiply
    13,379.82x = 20,063.91 × 7,138.45
  4. Step 4: Simplify right side
    13,379.82x = 143,225,118.02
  5. Step 5: Solve for x
    x = 143,225,118.02/13,379.82
  6. Step 6: Final answer
    x = 10,704.56

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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.