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Finding the Fourth Proportional to 139,391.63, 192,359.94 and 75,728.87

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Solution

The fourth proportional to 139,391.63, 192,359.94 and 75,728.87 is: 104,505.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,391.63 : 192,359.94 = 75,728.87 : x
  2. Step 2: Convert to fraction form
    139,391.63/192,359.94 = 75,728.87/x
  3. Step 3: Cross multiply
    139,391.63x = 192,359.94 × 75,728.87
  4. Step 4: Simplify right side
    139,391.63x = 14,567,200,889.47
  5. Step 5: Solve for x
    x = 14,567,200,889.47/139,391.63
  6. Step 6: Final answer
    x = 104,505.56

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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.