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Finding the Third Proportional to 395.75 and 505.75

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Solution

The third proportional to 395.75 and 505.75 is: 646.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.75 : 505.75 = 505.75 : x
  2. Step 2: Convert to fraction form
    395.75/505.75 = 505.75/x
  3. Step 3: Cross multiply
    395.75x = 505.75 × 505.75
  4. Step 4: Simplify right side
    395.75x = 255,783.06
  5. Step 5: Solve for x
    x = 255,783.06/395.75
  6. Step 6: Final answer
    x = 646.32

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.