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Finding the Third Proportional to 328.36 and 486.21

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Solution

The third proportional to 328.36 and 486.21 is: 719.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.36 : 486.21 = 486.21 : x
  2. Step 2: Convert to fraction form
    328.36/486.21 = 486.21/x
  3. Step 3: Cross multiply
    328.36x = 486.21 × 486.21
  4. Step 4: Simplify right side
    328.36x = 236,401.08
  5. Step 5: Solve for x
    x = 236,401.08/328.36
  6. Step 6: Final answer
    x = 719.95

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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.