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Finding the Fourth Proportional to 720,863.42, 994,780.57 and 394,177.47

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Solution

The fourth proportional to 720,863.42, 994,780.57 and 394,177.47 is: 543,958.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,863.42 : 994,780.57 = 394,177.47 : x
  2. Step 2: Convert to fraction form
    720,863.42/994,780.57 = 394,177.47/x
  3. Step 3: Cross multiply
    720,863.42x = 994,780.57 × 394,177.47
  4. Step 4: Simplify right side
    720,863.42x = 392,120,086,316.87
  5. Step 5: Solve for x
    x = 392,120,086,316.87/720,863.42
  6. Step 6: Final answer
    x = 543,958.92

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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.