Home / 139,331.28-192,289.14-78,912.57

Finding the Fourth Proportional to 139,331.28, 192,289.14 and 78,912.57

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Solution

The fourth proportional to 139,331.28, 192,289.14 and 78,912.57 is: 108,906.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,331.28 : 192,289.14 = 78,912.57 : x
  2. Step 2: Convert to fraction form
    139,331.28/192,289.14 = 78,912.57/x
  3. Step 3: Cross multiply
    139,331.28x = 192,289.14 × 78,912.57
  4. Step 4: Simplify right side
    139,331.28x = 15,174,030,220.49
  5. Step 5: Solve for x
    x = 15,174,030,220.49/139,331.28
  6. Step 6: Final answer
    x = 108,906.13

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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.