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Finding the Third Proportional to 644.63 and 912.09

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Solution

The third proportional to 644.63 and 912.09 is: 1,290.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.63 : 912.09 = 912.09 : x
  2. Step 2: Convert to fraction form
    644.63/912.09 = 912.09/x
  3. Step 3: Cross multiply
    644.63x = 912.09 × 912.09
  4. Step 4: Simplify right side
    644.63x = 831,915.01
  5. Step 5: Solve for x
    x = 831,915.01/644.63
  6. Step 6: Final answer
    x = 1,290.54

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.