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Finding the Fourth Proportional to 720,894.59, 994,791.79 and 398,579.39

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Solution

The fourth proportional to 720,894.59, 994,791.79 and 398,579.39 is: 550,015.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,894.59 : 994,791.79 = 398,579.39 : x
  2. Step 2: Convert to fraction form
    720,894.59/994,791.79 = 398,579.39/x
  3. Step 3: Cross multiply
    720,894.59x = 994,791.79 × 398,579.39
  4. Step 4: Simplify right side
    720,894.59x = 396,503,504,835.21
  5. Step 5: Solve for x
    x = 396,503,504,835.21/720,894.59
  6. Step 6: Final answer
    x = 550,015.93

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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.