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Finding the Third Proportional to 821.13 and 1,322.88

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Solution

The third proportional to 821.13 and 1,322.88 is: 2,131.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.13 : 1,322.88 = 1,322.88 : x
  2. Step 2: Convert to fraction form
    821.13/1,322.88 = 1,322.88/x
  3. Step 3: Cross multiply
    821.13x = 1,322.88 × 1,322.88
  4. Step 4: Simplify right side
    821.13x = 1,749,998.27
  5. Step 5: Solve for x
    x = 1,749,998.27/821.13
  6. Step 6: Final answer
    x = 2,131.22

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.