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Finding the Fourth Proportional to 205,791.80, 308,687.70 and 126,649.40

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Solution

The fourth proportional to 205,791.80, 308,687.70 and 126,649.40 is: 189,974.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,791.80 : 308,687.70 = 126,649.40 : x
  2. Step 2: Convert to fraction form
    205,791.80/308,687.70 = 126,649.40/x
  3. Step 3: Cross multiply
    205,791.80x = 308,687.70 × 126,649.40
  4. Step 4: Simplify right side
    205,791.80x = 39,095,111,992.38
  5. Step 5: Solve for x
    x = 39,095,111,992.38/205,791.80
  6. Step 6: Final answer
    x = 189,974.10

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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.