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Finding the Fourth Proportional to 139,391.19, 192,359.34 and 75,728.43

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Solution

The fourth proportional to 139,391.19, 192,359.34 and 75,728.43 is: 104,504.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,391.19 : 192,359.34 = 75,728.43 : x
  2. Step 2: Convert to fraction form
    139,391.19/192,359.34 = 75,728.43/x
  3. Step 3: Cross multiply
    139,391.19x = 192,359.34 × 75,728.43
  4. Step 4: Simplify right side
    139,391.19x = 14,567,070,814.04
  5. Step 5: Solve for x
    x = 14,567,070,814.04/139,391.19
  6. Step 6: Final answer
    x = 104,504.96

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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.