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Finding the Fourth Proportional to 139,706.36, 192,789.43 and 79,273.40

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Solution

The fourth proportional to 139,706.36, 192,789.43 and 79,273.40 is: 109,394.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,706.36 : 192,789.43 = 79,273.40 : x
  2. Step 2: Convert to fraction form
    139,706.36/192,789.43 = 79,273.40/x
  3. Step 3: Cross multiply
    139,706.36x = 192,789.43 × 79,273.40
  4. Step 4: Simplify right side
    139,706.36x = 15,283,073,600.16
  5. Step 5: Solve for x
    x = 15,283,073,600.16/139,706.36
  6. Step 6: Final answer
    x = 109,394.26

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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.