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Finding the Fourth Proportional to 339,791.78, 509,689.28 and 103,136.50

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Solution

The fourth proportional to 339,791.78, 509,689.28 and 103,136.50 is: 154,705.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,791.78 : 509,689.28 = 103,136.50 : x
  2. Step 2: Convert to fraction form
    339,791.78/509,689.28 = 103,136.50/x
  3. Step 3: Cross multiply
    339,791.78x = 509,689.28 × 103,136.50
  4. Step 4: Simplify right side
    339,791.78x = 52,567,568,426.72
  5. Step 5: Solve for x
    x = 52,567,568,426.72/339,791.78
  6. Step 6: Final answer
    x = 154,705.24

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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.