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Finding the Fourth Proportional to 639,978.03, 883,152.77 and 353,491.97

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Solution

The fourth proportional to 639,978.03, 883,152.77 and 353,491.97 is: 487,809.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,978.03 : 883,152.77 = 353,491.97 : x
  2. Step 2: Convert to fraction form
    639,978.03/883,152.77 = 353,491.97/x
  3. Step 3: Cross multiply
    639,978.03x = 883,152.77 × 353,491.97
  4. Step 4: Simplify right side
    639,978.03x = 312,187,406,295.03
  5. Step 5: Solve for x
    x = 312,187,406,295.03/639,978.03
  6. Step 6: Final answer
    x = 487,809.57

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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.