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Finding the Fourth Proportional to 139,198.50, 192,093.93 and 78,767.91

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Solution

The fourth proportional to 139,198.50, 192,093.93 and 78,767.91 is: 108,699.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,198.50 : 192,093.93 = 78,767.91 : x
  2. Step 2: Convert to fraction form
    139,198.50/192,093.93 = 78,767.91/x
  3. Step 3: Cross multiply
    139,198.50x = 192,093.93 × 78,767.91
  4. Step 4: Simplify right side
    139,198.50x = 15,130,837,389.79
  5. Step 5: Solve for x
    x = 15,130,837,389.79/139,198.50
  6. Step 6: Final answer
    x = 108,699.72

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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.