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Finding the Third Proportional to 320.75 and 656.50

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Solution

The third proportional to 320.75 and 656.50 is: 1,343.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.75 : 656.50 = 656.50 : x
  2. Step 2: Convert to fraction form
    320.75/656.50 = 656.50/x
  3. Step 3: Cross multiply
    320.75x = 656.50 × 656.50
  4. Step 4: Simplify right side
    320.75x = 430,992.25
  5. Step 5: Solve for x
    x = 430,992.25/320.75
  6. Step 6: Final answer
    x = 1,343.70

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.