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Finding the Fourth Proportional to 139,320.78, 192,274.65 and 78,902.07

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Solution

The fourth proportional to 139,320.78, 192,274.65 and 78,902.07 is: 108,891.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,320.78 : 192,274.65 = 78,902.07 : x
  2. Step 2: Convert to fraction form
    139,320.78/192,274.65 = 78,902.07/x
  3. Step 3: Cross multiply
    139,320.78x = 192,274.65 × 78,902.07
  4. Step 4: Simplify right side
    139,320.78x = 15,170,867,893.53
  5. Step 5: Solve for x
    x = 15,170,867,893.53/139,320.78
  6. Step 6: Final answer
    x = 108,891.64

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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.