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Finding the Fourth Proportional to 393,779.64, 543,226.74 and 257,753.64

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Solution

The fourth proportional to 393,779.64, 543,226.74 and 257,753.64 is: 355,576.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,779.64 : 543,226.74 = 257,753.64 : x
  2. Step 2: Convert to fraction form
    393,779.64/543,226.74 = 257,753.64/x
  3. Step 3: Cross multiply
    393,779.64x = 543,226.74 × 257,753.64
  4. Step 4: Simplify right side
    393,779.64x = 140,018,669,580.33
  5. Step 5: Solve for x
    x = 140,018,669,580.33/393,779.64
  6. Step 6: Final answer
    x = 355,576.20

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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.