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Finding the Fourth Proportional to 1,905.78, 2,857.44 and 809.86

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Solution

The fourth proportional to 1,905.78, 2,857.44 and 809.86 is: 1,214.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.78 : 2,857.44 = 809.86 : x
  2. Step 2: Convert to fraction form
    1,905.78/2,857.44 = 809.86/x
  3. Step 3: Cross multiply
    1,905.78x = 2,857.44 × 809.86
  4. Step 4: Simplify right side
    1,905.78x = 2,314,126.36
  5. Step 5: Solve for x
    x = 2,314,126.36/1,905.78
  6. Step 6: Final answer
    x = 1,214.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.