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Finding the Third Proportional to 320.75 and 354.50

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Solution

The third proportional to 320.75 and 354.50 is: 391.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.75 : 354.50 = 354.50 : x
  2. Step 2: Convert to fraction form
    320.75/354.50 = 354.50/x
  3. Step 3: Cross multiply
    320.75x = 354.50 × 354.50
  4. Step 4: Simplify right side
    320.75x = 125,670.25
  5. Step 5: Solve for x
    x = 125,670.25/320.75
  6. Step 6: Final answer
    x = 391.80

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.