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Finding the Fourth Proportional to 666,456.12, 919,573.56 and 394,387.85

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Solution

The fourth proportional to 666,456.12, 919,573.56 and 394,387.85 is: 544,174.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,456.12 : 919,573.56 = 394,387.85 : x
  2. Step 2: Convert to fraction form
    666,456.12/919,573.56 = 394,387.85/x
  3. Step 3: Cross multiply
    666,456.12x = 919,573.56 × 394,387.85
  4. Step 4: Simplify right side
    666,456.12x = 362,668,634,647.38
  5. Step 5: Solve for x
    x = 362,668,634,647.38/666,456.12
  6. Step 6: Final answer
    x = 544,174.81

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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.