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Finding the Third Proportional to 255.75 and 394.63

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Solution

The third proportional to 255.75 and 394.63 is: 608.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.75 : 394.63 = 394.63 : x
  2. Step 2: Convert to fraction form
    255.75/394.63 = 394.63/x
  3. Step 3: Cross multiply
    255.75x = 394.63 × 394.63
  4. Step 4: Simplify right side
    255.75x = 155,728.89
  5. Step 5: Solve for x
    x = 155,728.89/255.75
  6. Step 6: Final answer
    x = 608.91

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.