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Finding the Fourth Proportional to 619,709.27, 855,978.30 and 511,206.80

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Solution

The fourth proportional to 619,709.27, 855,978.30 and 511,206.80 is: 706,108.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,709.27 : 855,978.30 = 511,206.80 : x
  2. Step 2: Convert to fraction form
    619,709.27/855,978.30 = 511,206.80/x
  3. Step 3: Cross multiply
    619,709.27x = 855,978.30 × 511,206.80
  4. Step 4: Simplify right side
    619,709.27x = 437,581,923,332.55
  5. Step 5: Solve for x
    x = 437,581,923,332.55/619,709.27
  6. Step 6: Final answer
    x = 706,108.41

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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.