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Finding the Third Proportional to 321 and 379.75

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Solution

The third proportional to 321 and 379.75 is: 449.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    321 : 379.75 = 379.75 : x
  2. Step 2: Convert to fraction form
    321/379.75 = 379.75/x
  3. Step 3: Cross multiply
    321x = 379.75 × 379.75
  4. Step 4: Simplify right side
    321x = 144,210.06
  5. Step 5: Solve for x
    x = 144,210.06/321
  6. Step 6: Final answer
    x = 449.25

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.