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Finding the Third Proportional to 313.50 and 647.25

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Solution

The third proportional to 313.50 and 647.25 is: 1,336.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.50 : 647.25 = 647.25 : x
  2. Step 2: Convert to fraction form
    313.50/647.25 = 647.25/x
  3. Step 3: Cross multiply
    313.50x = 647.25 × 647.25
  4. Step 4: Simplify right side
    313.50x = 418,932.56
  5. Step 5: Solve for x
    x = 418,932.56/313.50
  6. Step 6: Final answer
    x = 1,336.31

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.