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Finding the Fourth Proportional to 339,709.20, 509,636.34 and 115,061.88

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Solution

The fourth proportional to 339,709.20, 509,636.34 and 115,061.88 is: 172,617.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,709.20 : 509,636.34 = 115,061.88 : x
  2. Step 2: Convert to fraction form
    339,709.20/509,636.34 = 115,061.88/x
  3. Step 3: Cross multiply
    339,709.20x = 509,636.34 × 115,061.88
  4. Step 4: Simplify right side
    339,709.20x = 58,639,715,396.72
  5. Step 5: Solve for x
    x = 58,639,715,396.72/339,709.20
  6. Step 6: Final answer
    x = 172,617.39

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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.