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Finding the Fourth Proportional to 640,680.40, 961,020.60 and 405,067.60

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Solution

The fourth proportional to 640,680.40, 961,020.60 and 405,067.60 is: 607,601.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,680.40 : 961,020.60 = 405,067.60 : x
  2. Step 2: Convert to fraction form
    640,680.40/961,020.60 = 405,067.60/x
  3. Step 3: Cross multiply
    640,680.40x = 961,020.60 × 405,067.60
  4. Step 4: Simplify right side
    640,680.40x = 389,278,307,992.56
  5. Step 5: Solve for x
    x = 389,278,307,992.56/640,680.40
  6. Step 6: Final answer
    x = 607,601.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.