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Finding the Fourth Proportional to 694,986, 959,074.20 and 393,180

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Solution

The fourth proportional to 694,986, 959,074.20 and 393,180 is: 542,584.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    694,986 : 959,074.20 = 393,180 : x
  2. Step 2: Convert to fraction form
    694,986/959,074.20 = 393,180/x
  3. Step 3: Cross multiply
    694,986x = 959,074.20 × 393,180
  4. Step 4: Simplify right side
    694,986x = 377,088,793,956
  5. Step 5: Solve for x
    x = 377,088,793,956/694,986
  6. Step 6: Final answer
    x = 542,584.73

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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.