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Finding the Fourth Proportional to 139,224.24, 192,138.21 and 78,771.87

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Solution

The fourth proportional to 139,224.24, 192,138.21 and 78,771.87 is: 108,710.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,224.24 : 192,138.21 = 78,771.87 : x
  2. Step 2: Convert to fraction form
    139,224.24/192,138.21 = 78,771.87/x
  3. Step 3: Cross multiply
    139,224.24x = 192,138.21 × 78,771.87
  4. Step 4: Simplify right side
    139,224.24x = 15,135,086,100.15
  5. Step 5: Solve for x
    x = 15,135,086,100.15/139,224.24
  6. Step 6: Final answer
    x = 108,710.14

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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.