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Finding the Fourth Proportional to 139,371.98, 192,338.62 and 78,119.28

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Solution

The fourth proportional to 139,371.98, 192,338.62 and 78,119.28 is: 107,807.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,371.98 : 192,338.62 = 78,119.28 : x
  2. Step 2: Convert to fraction form
    139,371.98/192,338.62 = 78,119.28/x
  3. Step 3: Cross multiply
    139,371.98x = 192,338.62 × 78,119.28
  4. Step 4: Simplify right side
    139,371.98x = 15,025,354,315.30
  5. Step 5: Solve for x
    x = 15,025,354,315.30/139,371.98
  6. Step 6: Final answer
    x = 107,807.57

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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.