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Finding the Third Proportional to 299.25 and 642.25

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Solution

The third proportional to 299.25 and 642.25 is: 1,378.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.25 : 642.25 = 642.25 : x
  2. Step 2: Convert to fraction form
    299.25/642.25 = 642.25/x
  3. Step 3: Cross multiply
    299.25x = 642.25 × 642.25
  4. Step 4: Simplify right side
    299.25x = 412,485.06
  5. Step 5: Solve for x
    x = 412,485.06/299.25
  6. Step 6: Final answer
    x = 1,378.40

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.