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Finding the Fourth Proportional to 689,641.88, 951,690.87 and 399,265.69

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Solution

The fourth proportional to 689,641.88, 951,690.87 and 399,265.69 is: 550,978.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,641.88 : 951,690.87 = 399,265.69 : x
  2. Step 2: Convert to fraction form
    689,641.88/951,690.87 = 399,265.69/x
  3. Step 3: Cross multiply
    689,641.88x = 951,690.87 × 399,265.69
  4. Step 4: Simplify right side
    689,641.88x = 379,977,514,564.11
  5. Step 5: Solve for x
    x = 379,977,514,564.11/689,641.88
  6. Step 6: Final answer
    x = 550,978.01

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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.