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Finding the Fourth Proportional to 205,810.80, 308,910.60 and 127,078.80

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Solution

The fourth proportional to 205,810.80, 308,910.60 and 127,078.80 is: 190,738.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,810.80 : 308,910.60 = 127,078.80 : x
  2. Step 2: Convert to fraction form
    205,810.80/308,910.60 = 127,078.80/x
  3. Step 3: Cross multiply
    205,810.80x = 308,910.60 × 127,078.80
  4. Step 4: Simplify right side
    205,810.80x = 39,255,988,355.28
  5. Step 5: Solve for x
    x = 39,255,988,355.28/205,810.80
  6. Step 6: Final answer
    x = 190,738.23

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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.