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Finding the Third Proportional to 287 and 628

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Solution

The third proportional to 287 and 628 is: 1,374.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    287 : 628 = 628 : x
  2. Step 2: Convert to fraction form
    287/628 = 628/x
  3. Step 3: Cross multiply
    287x = 628 × 628
  4. Step 4: Simplify right side
    287x = 394,384
  5. Step 5: Solve for x
    x = 394,384/287
  6. Step 6: Final answer
    x = 1,374.16

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.