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Finding the Fourth Proportional to 639,165.72, 958,749.68 and 511,891.49

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Solution

The fourth proportional to 639,165.72, 958,749.68 and 511,891.49 is: 767,838.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,165.72 : 958,749.68 = 511,891.49 : x
  2. Step 2: Convert to fraction form
    639,165.72/958,749.68 = 511,891.49/x
  3. Step 3: Cross multiply
    639,165.72x = 958,749.68 × 511,891.49
  4. Step 4: Simplify right side
    639,165.72x = 490,775,794,879.02
  5. Step 5: Solve for x
    x = 490,775,794,879.02/639,165.72
  6. Step 6: Final answer
    x = 767,838.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.