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Finding the Fourth Proportional to 128,000.40, 192,096.60 and 65,638.80

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Solution

The fourth proportional to 128,000.40, 192,096.60 and 65,638.80 is: 98,507.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,000.40 : 192,096.60 = 65,638.80 : x
  2. Step 2: Convert to fraction form
    128,000.40/192,096.60 = 65,638.80/x
  3. Step 3: Cross multiply
    128,000.40x = 192,096.60 × 65,638.80
  4. Step 4: Simplify right side
    128,000.40x = 12,608,990,308.08
  5. Step 5: Solve for x
    x = 12,608,990,308.08/128,000.40
  6. Step 6: Final answer
    x = 98,507.43

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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.