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Finding the Fourth Proportional to 619,997.94, 855,690.54 and 378,420.90

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Solution

The fourth proportional to 619,997.94, 855,690.54 and 378,420.90 is: 522,277.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,997.94 : 855,690.54 = 378,420.90 : x
  2. Step 2: Convert to fraction form
    619,997.94/855,690.54 = 378,420.90/x
  3. Step 3: Cross multiply
    619,997.94x = 855,690.54 × 378,420.90
  4. Step 4: Simplify right side
    619,997.94x = 323,811,184,268.29
  5. Step 5: Solve for x
    x = 323,811,184,268.29/619,997.94
  6. Step 6: Final answer
    x = 522,277.84

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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.