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Finding the Fourth Proportional to 69,129.78, 103,694.60 and 19,209.85

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Solution

The fourth proportional to 69,129.78, 103,694.60 and 19,209.85 is: 28,814.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,129.78 : 103,694.60 = 19,209.85 : x
  2. Step 2: Convert to fraction form
    69,129.78/103,694.60 = 19,209.85/x
  3. Step 3: Cross multiply
    69,129.78x = 103,694.60 × 19,209.85
  4. Step 4: Simplify right side
    69,129.78x = 1,991,957,711.81
  5. Step 5: Solve for x
    x = 1,991,957,711.81/69,129.78
  6. Step 6: Final answer
    x = 28,814.76

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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.