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Finding the Fourth Proportional to 643,656.85, 888,257.77 and 353,295.61

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Solution

The fourth proportional to 643,656.85, 888,257.77 and 353,295.61 is: 487,554.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,656.85 : 888,257.77 = 353,295.61 : x
  2. Step 2: Convert to fraction form
    643,656.85/888,257.77 = 353,295.61/x
  3. Step 3: Cross multiply
    643,656.85x = 888,257.77 × 353,295.61
  4. Step 4: Simplify right side
    643,656.85x = 313,817,567,585.51
  5. Step 5: Solve for x
    x = 313,817,567,585.51/643,656.85
  6. Step 6: Final answer
    x = 487,554.15

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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.