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Finding the Fourth Proportional to 205,945.10, 308,917.65 and 65,717.90

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Solution

The fourth proportional to 205,945.10, 308,917.65 and 65,717.90 is: 98,576.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,945.10 : 308,917.65 = 65,717.90 : x
  2. Step 2: Convert to fraction form
    205,945.10/308,917.65 = 65,717.90/x
  3. Step 3: Cross multiply
    205,945.10x = 308,917.65 × 65,717.90
  4. Step 4: Simplify right side
    205,945.10x = 20,301,419,230.94
  5. Step 5: Solve for x
    x = 20,301,419,230.94/205,945.10
  6. Step 6: Final answer
    x = 98,576.85

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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.