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Finding the Fourth Proportional to 378,911.44, 522,897.83 and 209,145.61

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Solution

The fourth proportional to 378,911.44, 522,897.83 and 209,145.61 is: 288,620.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,911.44 : 522,897.83 = 209,145.61 : x
  2. Step 2: Convert to fraction form
    378,911.44/522,897.83 = 209,145.61/x
  3. Step 3: Cross multiply
    378,911.44x = 522,897.83 × 209,145.61
  4. Step 4: Simplify right side
    378,911.44x = 109,361,784,838.65
  5. Step 5: Solve for x
    x = 109,361,784,838.65/378,911.44
  6. Step 6: Final answer
    x = 288,620.97

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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.