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Finding the Fourth Proportional to 408,693.88, 613,040.10 and 128,210.68

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Solution

The fourth proportional to 408,693.88, 613,040.10 and 128,210.68 is: 192,315.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,693.88 : 613,040.10 = 128,210.68 : x
  2. Step 2: Convert to fraction form
    408,693.88/613,040.10 = 128,210.68/x
  3. Step 3: Cross multiply
    408,693.88x = 613,040.10 × 128,210.68
  4. Step 4: Simplify right side
    408,693.88x = 78,598,288,088.27
  5. Step 5: Solve for x
    x = 78,598,288,088.27/408,693.88
  6. Step 6: Final answer
    x = 192,315.79

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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.