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Finding the Fourth Proportional to 66,871.20, 100,321.20 and 20,128.80

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Solution

The fourth proportional to 66,871.20, 100,321.20 and 20,128.80 is: 30,197.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,871.20 : 100,321.20 = 20,128.80 : x
  2. Step 2: Convert to fraction form
    66,871.20/100,321.20 = 20,128.80/x
  3. Step 3: Cross multiply
    66,871.20x = 100,321.20 × 20,128.80
  4. Step 4: Simplify right side
    66,871.20x = 2,019,345,370.56
  5. Step 5: Solve for x
    x = 2,019,345,370.56/66,871.20
  6. Step 6: Final answer
    x = 30,197.53

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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.