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Finding the Third Proportional to 217.50 and 319.50

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Solution

The third proportional to 217.50 and 319.50 is: 469.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.50 : 319.50 = 319.50 : x
  2. Step 2: Convert to fraction form
    217.50/319.50 = 319.50/x
  3. Step 3: Cross multiply
    217.50x = 319.50 × 319.50
  4. Step 4: Simplify right side
    217.50x = 102,080.25
  5. Step 5: Solve for x
    x = 102,080.25/217.50
  6. Step 6: Final answer
    x = 469.33

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.