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Finding the Third Proportional to 621.75 and 911.25

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Solution

The third proportional to 621.75 and 911.25 is: 1,335.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.75 : 911.25 = 911.25 : x
  2. Step 2: Convert to fraction form
    621.75/911.25 = 911.25/x
  3. Step 3: Cross multiply
    621.75x = 911.25 × 911.25
  4. Step 4: Simplify right side
    621.75x = 830,376.56
  5. Step 5: Solve for x
    x = 830,376.56/621.75
  6. Step 6: Final answer
    x = 1,335.55

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.