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Finding the Fourth Proportional to 66,938.58, 100,408.59 and 20,191.86

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Solution

The fourth proportional to 66,938.58, 100,408.59 and 20,191.86 is: 30,288.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,938.58 : 100,408.59 = 20,191.86 : x
  2. Step 2: Convert to fraction form
    66,938.58/100,408.59 = 20,191.86/x
  3. Step 3: Cross multiply
    66,938.58x = 100,408.59 × 20,191.86
  4. Step 4: Simplify right side
    66,938.58x = 2,027,436,192.08
  5. Step 5: Solve for x
    x = 2,027,436,192.08/66,938.58
  6. Step 6: Final answer
    x = 30,288.01

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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.