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Finding the Fourth Proportional to 666,278.81, 919,523.28 and 394,209.53

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Solution

The fourth proportional to 666,278.81, 919,523.28 and 394,209.53 is: 544,043.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,278.81 : 919,523.28 = 394,209.53 : x
  2. Step 2: Convert to fraction form
    666,278.81/919,523.28 = 394,209.53/x
  3. Step 3: Cross multiply
    666,278.81x = 919,523.28 × 394,209.53
  4. Step 4: Simplify right side
    666,278.81x = 362,484,840,032.86
  5. Step 5: Solve for x
    x = 362,484,840,032.86/666,278.81
  6. Step 6: Final answer
    x = 544,043.78

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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.