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Finding the Third Proportional to 644.50 and 745.50

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Solution

The third proportional to 644.50 and 745.50 is: 862.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.50 : 745.50 = 745.50 : x
  2. Step 2: Convert to fraction form
    644.50/745.50 = 745.50/x
  3. Step 3: Cross multiply
    644.50x = 745.50 × 745.50
  4. Step 4: Simplify right side
    644.50x = 555,770.25
  5. Step 5: Solve for x
    x = 555,770.25/644.50
  6. Step 6: Final answer
    x = 862.33

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Why These Related Problems?

These problems maintain the same ratio (1.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.