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Finding the Fourth Proportional to 79,121.80, 109,194.60 and 45,131.68

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Solution

The fourth proportional to 79,121.80, 109,194.60 and 45,131.68 is: 62,285.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,121.80 : 109,194.60 = 45,131.68 : x
  2. Step 2: Convert to fraction form
    79,121.80/109,194.60 = 45,131.68/x
  3. Step 3: Cross multiply
    79,121.80x = 109,194.60 × 45,131.68
  4. Step 4: Simplify right side
    79,121.80x = 4,928,135,744.93
  5. Step 5: Solve for x
    x = 4,928,135,744.93/79,121.80
  6. Step 6: Final answer
    x = 62,285.44

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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.