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Finding the Fourth Proportional to 20,721.60, 31,079.60 and 8,250.80

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Solution

The fourth proportional to 20,721.60, 31,079.60 and 8,250.80 is: 12,375.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.60 : 31,079.60 = 8,250.80 : x
  2. Step 2: Convert to fraction form
    20,721.60/31,079.60 = 8,250.80/x
  3. Step 3: Cross multiply
    20,721.60x = 31,079.60 × 8,250.80
  4. Step 4: Simplify right side
    20,721.60x = 256,431,563.68
  5. Step 5: Solve for x
    x = 256,431,563.68/20,721.60
  6. Step 6: Final answer
    x = 12,375.09

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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.