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Finding the Fourth Proportional to 206,645.12, 309,938.24 and 66,385.60

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Solution

The fourth proportional to 206,645.12, 309,938.24 and 66,385.60 is: 99,568.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,645.12 : 309,938.24 = 66,385.60 : x
  2. Step 2: Convert to fraction form
    206,645.12/309,938.24 = 66,385.60/x
  3. Step 3: Cross multiply
    206,645.12x = 309,938.24 × 66,385.60
  4. Step 4: Simplify right side
    206,645.12x = 20,575,436,025.34
  5. Step 5: Solve for x
    x = 20,575,436,025.34/206,645.12
  6. Step 6: Final answer
    x = 99,568.94

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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.