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Finding the Fourth Proportional to 69,107.72, 103,660.14 and 19,859.72

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Solution

The fourth proportional to 69,107.72, 103,660.14 and 19,859.72 is: 29,789.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,107.72 : 103,660.14 = 19,859.72 : x
  2. Step 2: Convert to fraction form
    69,107.72/103,660.14 = 19,859.72/x
  3. Step 3: Cross multiply
    69,107.72x = 103,660.14 × 19,859.72
  4. Step 4: Simplify right side
    69,107.72x = 2,058,661,355.56
  5. Step 5: Solve for x
    x = 2,058,661,355.56/69,107.72
  6. Step 6: Final answer
    x = 29,789.17

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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.