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Finding the Third Proportional to 380.75 and 625.75

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Solution

The third proportional to 380.75 and 625.75 is: 1,028.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.75 : 625.75 = 625.75 : x
  2. Step 2: Convert to fraction form
    380.75/625.75 = 625.75/x
  3. Step 3: Cross multiply
    380.75x = 625.75 × 625.75
  4. Step 4: Simplify right side
    380.75x = 391,563.06
  5. Step 5: Solve for x
    x = 391,563.06/380.75
  6. Step 6: Final answer
    x = 1,028.40

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.