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Finding the Fourth Proportional to 639,687.40, 882,764.82 and 353,205.16

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Solution

The fourth proportional to 639,687.40, 882,764.82 and 353,205.16 is: 487,421.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,687.40 : 882,764.82 = 353,205.16 : x
  2. Step 2: Convert to fraction form
    639,687.40/882,764.82 = 353,205.16/x
  3. Step 3: Cross multiply
    639,687.40x = 882,764.82 × 353,205.16
  4. Step 4: Simplify right side
    639,687.40x = 311,797,089,490.47
  5. Step 5: Solve for x
    x = 311,797,089,490.47/639,687.40
  6. Step 6: Final answer
    x = 487,421.03

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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.