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Finding the Fourth Proportional to 620,218.37, 855,994.01 and 378,641.21

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Solution

The fourth proportional to 620,218.37, 855,994.01 and 378,641.21 is: 522,581.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,218.37 : 855,994.01 = 378,641.21 : x
  2. Step 2: Convert to fraction form
    620,218.37/855,994.01 = 378,641.21/x
  3. Step 3: Cross multiply
    620,218.37x = 855,994.01 × 378,641.21
  4. Step 4: Simplify right side
    620,218.37x = 324,114,601,525.98
  5. Step 5: Solve for x
    x = 324,114,601,525.98/620,218.37
  6. Step 6: Final answer
    x = 522,581.43

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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.