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Finding the Fourth Proportional to 28,161.20, 38,815.80 and 20,190.80

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Solution

The fourth proportional to 28,161.20, 38,815.80 and 20,190.80 is: 27,829.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,161.20 : 38,815.80 = 20,190.80 : x
  2. Step 2: Convert to fraction form
    28,161.20/38,815.80 = 20,190.80/x
  3. Step 3: Cross multiply
    28,161.20x = 38,815.80 × 20,190.80
  4. Step 4: Simplify right side
    28,161.20x = 783,722,054.64
  5. Step 5: Solve for x
    x = 783,722,054.64/28,161.20
  6. Step 6: Final answer
    x = 27,829.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.