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Finding the Fourth Proportional to 393,686.89, 543,286.80 and 223,921.01

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Solution

The fourth proportional to 393,686.89, 543,286.80 and 223,921.01 is: 309,010.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,686.89 : 543,286.80 = 223,921.01 : x
  2. Step 2: Convert to fraction form
    393,686.89/543,286.80 = 223,921.01/x
  3. Step 3: Cross multiply
    393,686.89x = 543,286.80 × 223,921.01
  4. Step 4: Simplify right side
    393,686.89x = 121,653,330,333.89
  5. Step 5: Solve for x
    x = 121,653,330,333.89/393,686.89
  6. Step 6: Final answer
    x = 309,010.37

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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.