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Finding the Fourth Proportional to 139,340.30, 192,289.99 and 81,981.78

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Solution

The fourth proportional to 139,340.30, 192,289.99 and 81,981.78 is: 113,135.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,340.30 : 192,289.99 = 81,981.78 : x
  2. Step 2: Convert to fraction form
    139,340.30/192,289.99 = 81,981.78/x
  3. Step 3: Cross multiply
    139,340.30x = 192,289.99 × 81,981.78
  4. Step 4: Simplify right side
    139,340.30x = 15,764,275,656.38
  5. Step 5: Solve for x
    x = 15,764,275,656.38/139,340.30
  6. Step 6: Final answer
    x = 113,135.08

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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.