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Finding the Third Proportional to 635.50 and 1,115

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Solution

The third proportional to 635.50 and 1,115 is: 1,956.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.50 : 1,115 = 1,115 : x
  2. Step 2: Convert to fraction form
    635.50/1,115 = 1,115/x
  3. Step 3: Cross multiply
    635.50x = 1,115 × 1,115
  4. Step 4: Simplify right side
    635.50x = 1,243,225
  5. Step 5: Solve for x
    x = 1,243,225/635.50
  6. Step 6: Final answer
    x = 1,956.29

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Why These Related Problems?

These problems maintain the same ratio (1.75) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.