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Finding the Fourth Proportional to 205,843.80, 308,765.70 and 139,315.80

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Solution

The fourth proportional to 205,843.80, 308,765.70 and 139,315.80 is: 208,973.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,843.80 : 308,765.70 = 139,315.80 : x
  2. Step 2: Convert to fraction form
    205,843.80/308,765.70 = 139,315.80/x
  3. Step 3: Cross multiply
    205,843.80x = 308,765.70 × 139,315.80
  4. Step 4: Simplify right side
    205,843.80x = 43,015,940,508.06
  5. Step 5: Solve for x
    x = 43,015,940,508.06/205,843.80
  6. Step 6: Final answer
    x = 208,973.70

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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.