Home / 139,242.12-192,151.26-78,811.68

Finding the Fourth Proportional to 139,242.12, 192,151.26 and 78,811.68

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Solution

The fourth proportional to 139,242.12, 192,151.26 and 78,811.68 is: 108,758.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,242.12 : 192,151.26 = 78,811.68 : x
  2. Step 2: Convert to fraction form
    139,242.12/192,151.26 = 78,811.68/x
  3. Step 3: Cross multiply
    139,242.12x = 192,151.26 × 78,811.68
  4. Step 4: Simplify right side
    139,242.12x = 15,143,763,614.72
  5. Step 5: Solve for x
    x = 15,143,763,614.72/139,242.12
  6. Step 6: Final answer
    x = 108,758.50

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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.