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Finding the Fourth Proportional to 393,666.75, 543,348.72 and 257,621.87

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Solution

The fourth proportional to 393,666.75, 543,348.72 and 257,621.87 is: 355,576.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,666.75 : 543,348.72 = 257,621.87 : x
  2. Step 2: Convert to fraction form
    393,666.75/543,348.72 = 257,621.87/x
  3. Step 3: Cross multiply
    393,666.75x = 543,348.72 × 257,621.87
  4. Step 4: Simplify right side
    393,666.75x = 139,978,514,666.88
  5. Step 5: Solve for x
    x = 139,978,514,666.88/393,666.75
  6. Step 6: Final answer
    x = 355,576.17

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1.5x scale

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.