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Finding the Third Proportional to 821.81 and 1,229.72

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Solution

The third proportional to 821.81 and 1,229.72 is: 1,840.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.81 : 1,229.72 = 1,229.72 : x
  2. Step 2: Convert to fraction form
    821.81/1,229.72 = 1,229.72/x
  3. Step 3: Cross multiply
    821.81x = 1,229.72 × 1,229.72
  4. Step 4: Simplify right side
    821.81x = 1,512,208.20
  5. Step 5: Solve for x
    x = 1,512,208.20/821.81
  6. Step 6: Final answer
    x = 1,840.09

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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.