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Finding the Third Proportional to 321 and 395.50

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Solution

The third proportional to 321 and 395.50 is: 487.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    321 : 395.50 = 395.50 : x
  2. Step 2: Convert to fraction form
    321/395.50 = 395.50/x
  3. Step 3: Cross multiply
    321x = 395.50 × 395.50
  4. Step 4: Simplify right side
    321x = 156,420.25
  5. Step 5: Solve for x
    x = 156,420.25/321
  6. Step 6: Final answer
    x = 487.29

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Why These Related Problems?

These problems maintain the same ratio (1.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.