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Finding the Fourth Proportional to 259,861.68, 389,791.92 and 101,979.72

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Solution

The fourth proportional to 259,861.68, 389,791.92 and 101,979.72 is: 152,969.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,861.68 : 389,791.92 = 101,979.72 : x
  2. Step 2: Convert to fraction form
    259,861.68/389,791.92 = 101,979.72/x
  3. Step 3: Cross multiply
    259,861.68x = 389,791.92 × 101,979.72
  4. Step 4: Simplify right side
    259,861.68x = 39,750,870,859.86
  5. Step 5: Solve for x
    x = 39,750,870,859.86/259,861.68
  6. Step 6: Final answer
    x = 152,969.34

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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.