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Finding the Third Proportional to 351.25 and 491.25

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Solution

The third proportional to 351.25 and 491.25 is: 687.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.25 : 491.25 = 491.25 : x
  2. Step 2: Convert to fraction form
    351.25/491.25 = 491.25/x
  3. Step 3: Cross multiply
    351.25x = 491.25 × 491.25
  4. Step 4: Simplify right side
    351.25x = 241,326.56
  5. Step 5: Solve for x
    x = 241,326.56/351.25
  6. Step 6: Final answer
    x = 687.05

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.