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Finding the Fourth Proportional to 339,940.80, 509,889.60 and 115,300.80

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Solution

The fourth proportional to 339,940.80, 509,889.60 and 115,300.80 is: 172,943.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,940.80 : 509,889.60 = 115,300.80 : x
  2. Step 2: Convert to fraction form
    339,940.80/509,889.60 = 115,300.80/x
  3. Step 3: Cross multiply
    339,940.80x = 509,889.60 × 115,300.80
  4. Step 4: Simplify right side
    339,940.80x = 58,790,678,791.68
  5. Step 5: Solve for x
    x = 58,790,678,791.68/339,940.80
  6. Step 6: Final answer
    x = 172,943.87

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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.