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Finding the Third Proportional to 320.75 and 480.63

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Solution

The third proportional to 320.75 and 480.63 is: 720.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.75 : 480.63 = 480.63 : x
  2. Step 2: Convert to fraction form
    320.75/480.63 = 480.63/x
  3. Step 3: Cross multiply
    320.75x = 480.63 × 480.63
  4. Step 4: Simplify right side
    320.75x = 231,000.39
  5. Step 5: Solve for x
    x = 231,000.39/320.75
  6. Step 6: Final answer
    x = 720.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.