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Finding the Third Proportional to 216.94 and 321.84

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Solution

The third proportional to 216.94 and 321.84 is: 477.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.94 : 321.84 = 321.84 : x
  2. Step 2: Convert to fraction form
    216.94/321.84 = 321.84/x
  3. Step 3: Cross multiply
    216.94x = 321.84 × 321.84
  4. Step 4: Simplify right side
    216.94x = 103,583.40
  5. Step 5: Solve for x
    x = 103,583.40/216.94
  6. Step 6: Final answer
    x = 477.48

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.