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Finding the Third Proportional to 156 and 399

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Solution

The third proportional to 156 and 399 is: 1,020.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    156 : 399 = 399 : x
  2. Step 2: Convert to fraction form
    156/399 = 399/x
  3. Step 3: Cross multiply
    156x = 399 × 399
  4. Step 4: Simplify right side
    156x = 159,201
  5. Step 5: Solve for x
    x = 159,201/156
  6. Step 6: Final answer
    x = 1,020.52

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Why These Related Problems?

These problems maintain the same ratio (2.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.