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Finding the Fourth Proportional to 720,894.09, 994,791.10 and 398,578.89

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Solution

The fourth proportional to 720,894.09, 994,791.10 and 398,578.89 is: 550,015.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,894.09 : 994,791.10 = 398,578.89 : x
  2. Step 2: Convert to fraction form
    720,894.09/994,791.10 = 398,578.89/x
  3. Step 3: Cross multiply
    720,894.09x = 994,791.10 × 398,578.89
  4. Step 4: Simplify right side
    720,894.09x = 396,502,732,419.88
  5. Step 5: Solve for x
    x = 396,502,732,419.88/720,894.09
  6. Step 6: Final answer
    x = 550,015.24

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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.