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Finding the Third Proportional to 440.75 and 685.25

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Solution

The third proportional to 440.75 and 685.25 is: 1,065.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.75 : 685.25 = 685.25 : x
  2. Step 2: Convert to fraction form
    440.75/685.25 = 685.25/x
  3. Step 3: Cross multiply
    440.75x = 685.25 × 685.25
  4. Step 4: Simplify right side
    440.75x = 469,567.56
  5. Step 5: Solve for x
    x = 469,567.56/440.75
  6. Step 6: Final answer
    x = 1,065.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.