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Finding the Fourth Proportional to 128,176.80, 192,188.40 and 65,968.80

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Solution

The fourth proportional to 128,176.80, 192,188.40 and 65,968.80 is: 98,913.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,176.80 : 192,188.40 = 65,968.80 : x
  2. Step 2: Convert to fraction form
    128,176.80/192,188.40 = 65,968.80/x
  3. Step 3: Cross multiply
    128,176.80x = 192,188.40 × 65,968.80
  4. Step 4: Simplify right side
    128,176.80x = 12,678,438,121.92
  5. Step 5: Solve for x
    x = 12,678,438,121.92/128,176.80
  6. Step 6: Final answer
    x = 98,913.67

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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.