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Finding the Fourth Proportional to 139,147.74, 192,023.93 and 78,717.11

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Solution

The fourth proportional to 139,147.74, 192,023.93 and 78,717.11 is: 108,629.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,147.74 : 192,023.93 = 78,717.11 : x
  2. Step 2: Convert to fraction form
    139,147.74/192,023.93 = 78,717.11/x
  3. Step 3: Cross multiply
    139,147.74x = 192,023.93 × 78,717.11
  4. Step 4: Simplify right side
    139,147.74x = 15,115,568,057.12
  5. Step 5: Solve for x
    x = 15,115,568,057.12/139,147.74
  6. Step 6: Final answer
    x = 108,629.63

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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.