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Finding the Third Proportional to 687.23 and 1,211.20

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Solution

The third proportional to 687.23 and 1,211.20 is: 2,134.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.23 : 1,211.20 = 1,211.20 : x
  2. Step 2: Convert to fraction form
    687.23/1,211.20 = 1,211.20/x
  3. Step 3: Cross multiply
    687.23x = 1,211.20 × 1,211.20
  4. Step 4: Simplify right side
    687.23x = 1,467,013.01
  5. Step 5: Solve for x
    x = 1,467,013.01/687.23
  6. Step 6: Final answer
    x = 2,134.66

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Why These Related Problems?

These problems maintain the same ratio (1.76) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.