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Finding the Third Proportional to 520 and 810

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Solution

The third proportional to 520 and 810 is: 1,261.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    520 : 810 = 810 : x
  2. Step 2: Convert to fraction form
    520/810 = 810/x
  3. Step 3: Cross multiply
    520x = 810 × 810
  4. Step 4: Simplify right side
    520x = 656,100
  5. Step 5: Solve for x
    x = 656,100/520
  6. Step 6: Final answer
    x = 1,261.73

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.