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Finding the Fourth Proportional to 206,379.45, 309,507.87 and 79,991.52

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Solution

The fourth proportional to 206,379.45, 309,507.87 and 79,991.52 is: 119,963.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,379.45 : 309,507.87 = 79,991.52 : x
  2. Step 2: Convert to fraction form
    206,379.45/309,507.87 = 79,991.52/x
  3. Step 3: Cross multiply
    206,379.45x = 309,507.87 × 79,991.52
  4. Step 4: Simplify right side
    206,379.45x = 24,758,004,973.26
  5. Step 5: Solve for x
    x = 24,758,004,973.26/206,379.45
  6. Step 6: Final answer
    x = 119,963.52

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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.