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Finding the Third Proportional to 319.50 and 661.75

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Solution

The third proportional to 319.50 and 661.75 is: 1,370.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.50 : 661.75 = 661.75 : x
  2. Step 2: Convert to fraction form
    319.50/661.75 = 661.75/x
  3. Step 3: Cross multiply
    319.50x = 661.75 × 661.75
  4. Step 4: Simplify right side
    319.50x = 437,913.06
  5. Step 5: Solve for x
    x = 437,913.06/319.50
  6. Step 6: Final answer
    x = 1,370.62

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.