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Finding the Fourth Proportional to 339,917.40, 509,859.90 and 115,255.80

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Solution

The fourth proportional to 339,917.40, 509,859.90 and 115,255.80 is: 172,878.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,917.40 : 509,859.90 = 115,255.80 : x
  2. Step 2: Convert to fraction form
    339,917.40/509,859.90 = 115,255.80/x
  3. Step 3: Cross multiply
    339,917.40x = 509,859.90 × 115,255.80
  4. Step 4: Simplify right side
    339,917.40x = 58,764,310,662.42
  5. Step 5: Solve for x
    x = 58,764,310,662.42/339,917.40
  6. Step 6: Final answer
    x = 172,878.21

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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.