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Finding the Fourth Proportional to 38,704.80, 57,984.30 and 19,920.90

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Solution

The fourth proportional to 38,704.80, 57,984.30 and 19,920.90 is: 29,843.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,704.80 : 57,984.30 = 19,920.90 : x
  2. Step 2: Convert to fraction form
    38,704.80/57,984.30 = 19,920.90/x
  3. Step 3: Cross multiply
    38,704.80x = 57,984.30 × 19,920.90
  4. Step 4: Simplify right side
    38,704.80x = 1,155,099,441.87
  5. Step 5: Solve for x
    x = 1,155,099,441.87/38,704.80
  6. Step 6: Final answer
    x = 29,843.83

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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.