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Finding the Third Proportional to 820 and 1,330

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Solution

The third proportional to 820 and 1,330 is: 2,157.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    820 : 1,330 = 1,330 : x
  2. Step 2: Convert to fraction form
    820/1,330 = 1,330/x
  3. Step 3: Cross multiply
    820x = 1,330 × 1,330
  4. Step 4: Simplify right side
    820x = 1,768,900
  5. Step 5: Solve for x
    x = 1,768,900/820
  6. Step 6: Final answer
    x = 2,157.20

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Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.