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Finding the Fourth Proportional to 691,766, 954,651.66 and 389,960

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Solution

The fourth proportional to 691,766, 954,651.66 and 389,960 is: 538,153.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,766 : 954,651.66 = 389,960 : x
  2. Step 2: Convert to fraction form
    691,766/954,651.66 = 389,960/x
  3. Step 3: Cross multiply
    691,766x = 954,651.66 × 389,960
  4. Step 4: Simplify right side
    691,766x = 372,275,961,333.60
  5. Step 5: Solve for x
    x = 372,275,961,333.60/691,766
  6. Step 6: Final answer
    x = 538,153.02

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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.