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Finding the Fourth Proportional to 217,138.80, 325,724.40 and 76,879.20

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Solution

The fourth proportional to 217,138.80, 325,724.40 and 76,879.20 is: 115,324.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,138.80 : 325,724.40 = 76,879.20 : x
  2. Step 2: Convert to fraction form
    217,138.80/325,724.40 = 76,879.20/x
  3. Step 3: Cross multiply
    217,138.80x = 325,724.40 × 76,879.20
  4. Step 4: Simplify right side
    217,138.80x = 25,041,431,292.48
  5. Step 5: Solve for x
    x = 25,041,431,292.48/217,138.80
  6. Step 6: Final answer
    x = 115,324.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.