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Finding the Third Proportional to 288.75 and 635.50

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Solution

The third proportional to 288.75 and 635.50 is: 1,398.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.75 : 635.50 = 635.50 : x
  2. Step 2: Convert to fraction form
    288.75/635.50 = 635.50/x
  3. Step 3: Cross multiply
    288.75x = 635.50 × 635.50
  4. Step 4: Simplify right side
    288.75x = 403,860.25
  5. Step 5: Solve for x
    x = 403,860.25/288.75
  6. Step 6: Final answer
    x = 1,398.65

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.