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Finding the Fourth Proportional to 685,239.72, 945,730.35 and 394,794.78

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Solution

The fourth proportional to 685,239.72, 945,730.35 and 394,794.78 is: 544,874.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,239.72 : 945,730.35 = 394,794.78 : x
  2. Step 2: Convert to fraction form
    685,239.72/945,730.35 = 394,794.78/x
  3. Step 3: Cross multiply
    685,239.72x = 945,730.35 × 394,794.78
  4. Step 4: Simplify right side
    685,239.72x = 373,369,405,467.57
  5. Step 5: Solve for x
    x = 373,369,405,467.57/685,239.72
  6. Step 6: Final answer
    x = 544,874.14

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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.