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Finding the Fourth Proportional to 69,129.65, 103,694.41 and 19,209.72

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Solution

The fourth proportional to 69,129.65, 103,694.41 and 19,209.72 is: 28,814.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,129.65 : 103,694.41 = 19,209.72 : x
  2. Step 2: Convert to fraction form
    69,129.65/103,694.41 = 19,209.72/x
  3. Step 3: Cross multiply
    69,129.65x = 103,694.41 × 19,209.72
  4. Step 4: Simplify right side
    69,129.65x = 1,991,940,581.67
  5. Step 5: Solve for x
    x = 1,991,940,581.67/69,129.65
  6. Step 6: Final answer
    x = 28,814.56

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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.