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Finding the Third Proportional to 331 and 399.50

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Solution

The third proportional to 331 and 399.50 is: 482.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    331 : 399.50 = 399.50 : x
  2. Step 2: Convert to fraction form
    331/399.50 = 399.50/x
  3. Step 3: Cross multiply
    331x = 399.50 × 399.50
  4. Step 4: Simplify right side
    331x = 159,600.25
  5. Step 5: Solve for x
    x = 159,600.25/331
  6. Step 6: Final answer
    x = 482.18

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.