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Finding the Fourth Proportional to 861,639.84, 1,291,319.28 and 661,194

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Solution

The fourth proportional to 861,639.84, 1,291,319.28 and 661,194 is: 990,915.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,639.84 : 1,291,319.28 = 661,194 : x
  2. Step 2: Convert to fraction form
    861,639.84/1,291,319.28 = 661,194/x
  3. Step 3: Cross multiply
    861,639.84x = 1,291,319.28 × 661,194
  4. Step 4: Simplify right side
    861,639.84x = 853,812,560,020.32
  5. Step 5: Solve for x
    x = 853,812,560,020.32/861,639.84
  6. Step 6: Final answer
    x = 990,915.83

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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.