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Finding the Fourth Proportional to 720,877.90, 994,786.60 and 394,198.82

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Solution

The fourth proportional to 720,877.90, 994,786.60 and 394,198.82 is: 543,980.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,877.90 : 994,786.60 = 394,198.82 : x
  2. Step 2: Convert to fraction form
    720,877.90/994,786.60 = 394,198.82/x
  3. Step 3: Cross multiply
    720,877.90x = 994,786.60 × 394,198.82
  4. Step 4: Simplify right side
    720,877.90x = 392,143,703,871.81
  5. Step 5: Solve for x
    x = 392,143,703,871.81/720,877.90
  6. Step 6: Final answer
    x = 543,980.75

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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.