Home / 139,147.12-192,023.07-78,716.48

Finding the Fourth Proportional to 139,147.12, 192,023.07 and 78,716.48

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Solution

The fourth proportional to 139,147.12, 192,023.07 and 78,716.48 is: 108,628.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,147.12 : 192,023.07 = 78,716.48 : x
  2. Step 2: Convert to fraction form
    139,147.12/192,023.07 = 78,716.48/x
  3. Step 3: Cross multiply
    139,147.12x = 192,023.07 × 78,716.48
  4. Step 4: Simplify right side
    139,147.12x = 15,115,380,149.19
  5. Step 5: Solve for x
    x = 15,115,380,149.19/139,147.12
  6. Step 6: Final answer
    x = 108,628.77

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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.