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Finding the Fourth Proportional to 206,579.80, 309,869.70 and 205,413.40

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Solution

The fourth proportional to 206,579.80, 309,869.70 and 205,413.40 is: 308,120.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,579.80 : 309,869.70 = 205,413.40 : x
  2. Step 2: Convert to fraction form
    206,579.80/309,869.70 = 205,413.40/x
  3. Step 3: Cross multiply
    206,579.80x = 309,869.70 × 205,413.40
  4. Step 4: Simplify right side
    206,579.80x = 63,651,388,633.98
  5. Step 5: Solve for x
    x = 63,651,388,633.98/206,579.80
  6. Step 6: Final answer
    x = 308,120.10

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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.