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Finding the Fourth Proportional to 139,230.71, 192,138.56 and 75,568.50

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Solution

The fourth proportional to 139,230.71, 192,138.56 and 75,568.50 is: 104,284.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,230.71 : 192,138.56 = 75,568.50 : x
  2. Step 2: Convert to fraction form
    139,230.71/192,138.56 = 75,568.50/x
  3. Step 3: Cross multiply
    139,230.71x = 192,138.56 × 75,568.50
  4. Step 4: Simplify right side
    139,230.71x = 14,519,622,393.52
  5. Step 5: Solve for x
    x = 14,519,622,393.52/139,230.71
  6. Step 6: Final answer
    x = 104,284.63

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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.