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Finding the Fourth Proportional to 691,980.39, 954,911.28 and 405,691.15

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Solution

The fourth proportional to 691,980.39, 954,911.28 and 405,691.15 is: 559,841.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,980.39 : 954,911.28 = 405,691.15 : x
  2. Step 2: Convert to fraction form
    691,980.39/954,911.28 = 405,691.15/x
  3. Step 3: Cross multiply
    691,980.39x = 954,911.28 × 405,691.15
  4. Step 4: Simplify right side
    691,980.39x = 387,399,055,331.17
  5. Step 5: Solve for x
    x = 387,399,055,331.17/691,980.39
  6. Step 6: Final answer
    x = 559,841.09

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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.