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Finding the Fourth Proportional to 640,101.11, 959,940.60 and 213,519.38

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Solution

The fourth proportional to 640,101.11, 959,940.60 and 213,519.38 is: 320,208.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,101.11 : 959,940.60 = 213,519.38 : x
  2. Step 2: Convert to fraction form
    640,101.11/959,940.60 = 213,519.38/x
  3. Step 3: Cross multiply
    640,101.11x = 959,940.60 × 213,519.38
  4. Step 4: Simplify right side
    640,101.11x = 204,965,916,148.43
  5. Step 5: Solve for x
    x = 204,965,916,148.43/640,101.11
  6. Step 6: Final answer
    x = 320,208.66

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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.