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Finding the Third Proportional to 216.42 and 320.84

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Solution

The third proportional to 216.42 and 320.84 is: 475.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.42 : 320.84 = 320.84 : x
  2. Step 2: Convert to fraction form
    216.42/320.84 = 320.84/x
  3. Step 3: Cross multiply
    216.42x = 320.84 × 320.84
  4. Step 4: Simplify right side
    216.42x = 102,935.70
  5. Step 5: Solve for x
    x = 102,935.70/216.42
  6. Step 6: Final answer
    x = 475.63

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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.