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Finding the Fourth Proportional to 13,390.50, 20,079.90 and 7,149.12

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Solution

The fourth proportional to 13,390.50, 20,079.90 and 7,149.12 is: 10,720.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,390.50 : 20,079.90 = 7,149.12 : x
  2. Step 2: Convert to fraction form
    13,390.50/20,079.90 = 7,149.12/x
  3. Step 3: Cross multiply
    13,390.50x = 20,079.90 × 7,149.12
  4. Step 4: Simplify right side
    13,390.50x = 143,553,614.69
  5. Step 5: Solve for x
    x = 143,553,614.69/13,390.50
  6. Step 6: Final answer
    x = 10,720.56

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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.