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Finding the Fourth Proportional to 678,786.70, 936,695.34 and 407,004.56

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Solution

The fourth proportional to 678,786.70, 936,695.34 and 407,004.56 is: 561,648.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,786.70 : 936,695.34 = 407,004.56 : x
  2. Step 2: Convert to fraction form
    678,786.70/936,695.34 = 407,004.56/x
  3. Step 3: Cross multiply
    678,786.70x = 936,695.34 × 407,004.56
  4. Step 4: Simplify right side
    678,786.70x = 381,239,274,710.75
  5. Step 5: Solve for x
    x = 381,239,274,710.75/678,786.70
  6. Step 6: Final answer
    x = 561,648.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.