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Finding the Fourth Proportional to 66,843.20, 100,279.20 and 20,100.80

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Solution

The fourth proportional to 66,843.20, 100,279.20 and 20,100.80 is: 30,155.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,843.20 : 100,279.20 = 20,100.80 : x
  2. Step 2: Convert to fraction form
    66,843.20/100,279.20 = 20,100.80/x
  3. Step 3: Cross multiply
    66,843.20x = 100,279.20 × 20,100.80
  4. Step 4: Simplify right side
    66,843.20x = 2,015,692,143.36
  5. Step 5: Solve for x
    x = 2,015,692,143.36/66,843.20
  6. Step 6: Final answer
    x = 30,155.53

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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.