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Finding the Third Proportional to 621.50 and 868.75

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Solution

The third proportional to 621.50 and 868.75 is: 1,214.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.50 : 868.75 = 868.75 : x
  2. Step 2: Convert to fraction form
    621.50/868.75 = 868.75/x
  3. Step 3: Cross multiply
    621.50x = 868.75 × 868.75
  4. Step 4: Simplify right side
    621.50x = 754,726.56
  5. Step 5: Solve for x
    x = 754,726.56/621.50
  6. Step 6: Final answer
    x = 1,214.36

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.