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Finding the Fourth Proportional to 86,512.60, 129,768.90 and 66,829.60

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Solution

The fourth proportional to 86,512.60, 129,768.90 and 66,829.60 is: 100,244.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,512.60 : 129,768.90 = 66,829.60 : x
  2. Step 2: Convert to fraction form
    86,512.60/129,768.90 = 66,829.60/x
  3. Step 3: Cross multiply
    86,512.60x = 129,768.90 × 66,829.60
  4. Step 4: Simplify right side
    86,512.60x = 8,672,403,679.44
  5. Step 5: Solve for x
    x = 8,672,403,679.44/86,512.60
  6. Step 6: Final answer
    x = 100,244.40

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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.