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Finding the Fourth Proportional to 681,812.64, 940,893.78 and 391,431.11

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Solution

The fourth proportional to 681,812.64, 940,893.78 and 391,431.11 is: 540,170.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,812.64 : 940,893.78 = 391,431.11 : x
  2. Step 2: Convert to fraction form
    681,812.64/940,893.78 = 391,431.11/x
  3. Step 3: Cross multiply
    681,812.64x = 940,893.78 × 391,431.11
  4. Step 4: Simplify right side
    681,812.64x = 368,295,091,993.03
  5. Step 5: Solve for x
    x = 368,295,091,993.03/681,812.64
  6. Step 6: Final answer
    x = 540,170.53

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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.