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Finding the Fourth Proportional to 643,668.06, 888,203.04 and 381,978.30

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Solution

The fourth proportional to 643,668.06, 888,203.04 and 381,978.30 is: 527,095.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,668.06 : 888,203.04 = 381,978.30 : x
  2. Step 2: Convert to fraction form
    643,668.06/888,203.04 = 381,978.30/x
  3. Step 3: Cross multiply
    643,668.06x = 888,203.04 × 381,978.30
  4. Step 4: Simplify right side
    643,668.06x = 339,274,287,274.03
  5. Step 5: Solve for x
    x = 339,274,287,274.03/643,668.06
  6. Step 6: Final answer
    x = 527,095.11

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Double scale
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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.