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Finding the Fourth Proportional to 139,790.60, 192,919.13 and 105,273.52

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Solution

The fourth proportional to 139,790.60, 192,919.13 and 105,273.52 is: 145,283.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,790.60 : 192,919.13 = 105,273.52 : x
  2. Step 2: Convert to fraction form
    139,790.60/192,919.13 = 105,273.52/x
  3. Step 3: Cross multiply
    139,790.60x = 192,919.13 × 105,273.52
  4. Step 4: Simplify right side
    139,790.60x = 20,309,275,890.44
  5. Step 5: Solve for x
    x = 20,309,275,890.44/139,790.60
  6. Step 6: Final answer
    x = 145,283.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.