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Finding the Fourth Proportional to 139,340.44, 192,290.15 and 81,981.91

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Solution

The fourth proportional to 139,340.44, 192,290.15 and 81,981.91 is: 113,135.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,340.44 : 192,290.15 = 81,981.91 : x
  2. Step 2: Convert to fraction form
    139,340.44/192,290.15 = 81,981.91/x
  3. Step 3: Cross multiply
    139,340.44x = 192,290.15 × 81,981.91
  4. Step 4: Simplify right side
    139,340.44x = 15,764,313,771.19
  5. Step 5: Solve for x
    x = 15,764,313,771.19/139,340.44
  6. Step 6: Final answer
    x = 113,135.24

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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.