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Finding the Fourth Proportional to 28,009.20, 41,976.90 and 20,578.80

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Solution

The fourth proportional to 28,009.20, 41,976.90 and 20,578.80 is: 30,841.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,009.20 : 41,976.90 = 20,578.80 : x
  2. Step 2: Convert to fraction form
    28,009.20/41,976.90 = 20,578.80/x
  3. Step 3: Cross multiply
    28,009.20x = 41,976.90 × 20,578.80
  4. Step 4: Simplify right side
    28,009.20x = 863,834,229.72
  5. Step 5: Solve for x
    x = 863,834,229.72/28,009.20
  6. Step 6: Final answer
    x = 30,841.09

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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.