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Finding the Fourth Proportional to 681,645.78, 940,560.12 and 395,109.90

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Solution

The fourth proportional to 681,645.78, 940,560.12 and 395,109.90 is: 545,187.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,645.78 : 940,560.12 = 395,109.90 : x
  2. Step 2: Convert to fraction form
    681,645.78/940,560.12 = 395,109.90/x
  3. Step 3: Cross multiply
    681,645.78x = 940,560.12 × 395,109.90
  4. Step 4: Simplify right side
    681,645.78x = 371,624,614,957.19
  5. Step 5: Solve for x
    x = 371,624,614,957.19/681,645.78
  6. Step 6: Final answer
    x = 545,187.29

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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.