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Finding the Third Proportional to 385.50 and 644.25

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Solution

The third proportional to 385.50 and 644.25 is: 1,076.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.50 : 644.25 = 644.25 : x
  2. Step 2: Convert to fraction form
    385.50/644.25 = 644.25/x
  3. Step 3: Cross multiply
    385.50x = 644.25 × 644.25
  4. Step 4: Simplify right side
    385.50x = 415,058.06
  5. Step 5: Solve for x
    x = 415,058.06/385.50
  6. Step 6: Final answer
    x = 1,076.67

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.