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Finding the Fourth Proportional to 665,641.65, 919,028.43 and 393,796.65

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Solution

The fourth proportional to 665,641.65, 919,028.43 and 393,796.65 is: 543,701.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,641.65 : 919,028.43 = 393,796.65 : x
  2. Step 2: Convert to fraction form
    665,641.65/919,028.43 = 393,796.65/x
  3. Step 3: Cross multiply
    665,641.65x = 919,028.43 × 393,796.65
  4. Step 4: Simplify right side
    665,641.65x = 361,910,316,988.76
  5. Step 5: Solve for x
    x = 361,910,316,988.76/665,641.65
  6. Step 6: Final answer
    x = 543,701.43

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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.