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Finding the Fourth Proportional to 720,809.69, 994,685.87 and 394,116.54

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Solution

The fourth proportional to 720,809.69, 994,685.87 and 394,116.54 is: 543,863.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,809.69 : 994,685.87 = 394,116.54 : x
  2. Step 2: Convert to fraction form
    720,809.69/994,685.87 = 394,116.54/x
  3. Step 3: Cross multiply
    720,809.69x = 994,685.87 × 394,116.54
  4. Step 4: Simplify right side
    720,809.69x = 392,022,150,726.51
  5. Step 5: Solve for x
    x = 392,022,150,726.51/720,809.69
  6. Step 6: Final answer
    x = 543,863.60

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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.