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Finding the Third Proportional to 1,115 and 1,668.50

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Solution

The third proportional to 1,115 and 1,668.50 is: 2,496.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115 : 1,668.50 = 1,668.50 : x
  2. Step 2: Convert to fraction form
    1,115/1,668.50 = 1,668.50/x
  3. Step 3: Cross multiply
    1,115x = 1,668.50 × 1,668.50
  4. Step 4: Simplify right side
    1,115x = 2,783,892.25
  5. Step 5: Solve for x
    x = 2,783,892.25/1,115
  6. Step 6: Final answer
    x = 2,496.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.