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Finding the Third Proportional to 644.50 and 1,028

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Solution

The third proportional to 644.50 and 1,028 is: 1,639.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.50 : 1,028 = 1,028 : x
  2. Step 2: Convert to fraction form
    644.50/1,028 = 1,028/x
  3. Step 3: Cross multiply
    644.50x = 1,028 × 1,028
  4. Step 4: Simplify right side
    644.50x = 1,056,784
  5. Step 5: Solve for x
    x = 1,056,784/644.50
  6. Step 6: Final answer
    x = 1,639.70

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.