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Finding the Third Proportional to 87 and 211.31

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Solution

The third proportional to 87 and 211.31 is: 513.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    87 : 211.31 = 211.31 : x
  2. Step 2: Convert to fraction form
    87/211.31 = 211.31/x
  3. Step 3: Cross multiply
    87x = 211.31 × 211.31
  4. Step 4: Simplify right side
    87x = 44,652.97
  5. Step 5: Solve for x
    x = 44,652.97/87
  6. Step 6: Final answer
    x = 513.25

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Why These Related Problems?

These problems maintain the same ratio (2.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.