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Finding the Third Proportional to 292.78 and 644.41

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Solution

The third proportional to 292.78 and 644.41 is: 1,418.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.78 : 644.41 = 644.41 : x
  2. Step 2: Convert to fraction form
    292.78/644.41 = 644.41/x
  3. Step 3: Cross multiply
    292.78x = 644.41 × 644.41
  4. Step 4: Simplify right side
    292.78x = 415,269.48
  5. Step 5: Solve for x
    x = 415,269.48/292.78
  6. Step 6: Final answer
    x = 1,418.36

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.