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Finding the Third Proportional to 820.13 and 1,087.80

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Solution

The third proportional to 820.13 and 1,087.80 is: 1,442.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.13 : 1,087.80 = 1,087.80 : x
  2. Step 2: Convert to fraction form
    820.13/1,087.80 = 1,087.80/x
  3. Step 3: Cross multiply
    820.13x = 1,087.80 × 1,087.80
  4. Step 4: Simplify right side
    820.13x = 1,183,319.04
  5. Step 5: Solve for x
    x = 1,183,319.04/820.13
  6. Step 6: Final answer
    x = 1,442.85

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.