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Finding the Fourth Proportional to 66,974.80, 100,425.70 and 20,221.60

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Solution

The fourth proportional to 66,974.80, 100,425.70 and 20,221.60 is: 30,321.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,974.80 : 100,425.70 = 20,221.60 : x
  2. Step 2: Convert to fraction form
    66,974.80/100,425.70 = 20,221.60/x
  3. Step 3: Cross multiply
    66,974.80x = 100,425.70 × 20,221.60
  4. Step 4: Simplify right side
    66,974.80x = 2,030,768,335.12
  5. Step 5: Solve for x
    x = 2,030,768,335.12/66,974.80
  6. Step 6: Final answer
    x = 30,321.38

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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.