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Finding the Third Proportional to 813 and 1,221.75

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Solution

The third proportional to 813 and 1,221.75 is: 1,836.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    813 : 1,221.75 = 1,221.75 : x
  2. Step 2: Convert to fraction form
    813/1,221.75 = 1,221.75/x
  3. Step 3: Cross multiply
    813x = 1,221.75 × 1,221.75
  4. Step 4: Simplify right side
    813x = 1,492,673.06
  5. Step 5: Solve for x
    x = 1,492,673.06/813
  6. Step 6: Final answer
    x = 1,836.01

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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.