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Finding the Fourth Proportional to 139,471.36, 192,469.75 and 75,809.50

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Solution

The fourth proportional to 139,471.36, 192,469.75 and 75,809.50 is: 104,616.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,471.36 : 192,469.75 = 75,809.50 : x
  2. Step 2: Convert to fraction form
    139,471.36/192,469.75 = 75,809.50/x
  3. Step 3: Cross multiply
    139,471.36x = 192,469.75 × 75,809.50
  4. Step 4: Simplify right side
    139,471.36x = 14,591,035,512.63
  5. Step 5: Solve for x
    x = 14,591,035,512.63/139,471.36
  6. Step 6: Final answer
    x = 104,616.71

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1.5x scale

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.