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Finding the Fourth Proportional to 139,449.78, 192,435.28 and 75,786.21

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Solution

The fourth proportional to 139,449.78, 192,435.28 and 75,786.21 is: 104,582.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,449.78 : 192,435.28 = 75,786.21 : x
  2. Step 2: Convert to fraction form
    139,449.78/192,435.28 = 75,786.21/x
  3. Step 3: Cross multiply
    139,449.78x = 192,435.28 × 75,786.21
  4. Step 4: Simplify right side
    139,449.78x = 14,583,940,352.02
  5. Step 5: Solve for x
    x = 14,583,940,352.02/139,449.78
  6. Step 6: Final answer
    x = 104,582.02

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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.