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Finding the Fourth Proportional to 216,991, 325,473.54 and 67,231.72

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Solution

The fourth proportional to 216,991, 325,473.54 and 67,231.72 is: 100,843.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,991 : 325,473.54 = 67,231.72 : x
  2. Step 2: Convert to fraction form
    216,991/325,473.54 = 67,231.72/x
  3. Step 3: Cross multiply
    216,991x = 325,473.54 × 67,231.72
  4. Step 4: Simplify right side
    216,991x = 21,882,145,908.69
  5. Step 5: Solve for x
    x = 21,882,145,908.69/216,991
  6. Step 6: Final answer
    x = 100,843.56

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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.