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Finding the Third Proportional to 255.75 and 405.94

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Solution

The third proportional to 255.75 and 405.94 is: 644.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.75 : 405.94 = 405.94 : x
  2. Step 2: Convert to fraction form
    255.75/405.94 = 405.94/x
  3. Step 3: Cross multiply
    255.75x = 405.94 × 405.94
  4. Step 4: Simplify right side
    255.75x = 164,785.25
  5. Step 5: Solve for x
    x = 164,785.25/255.75
  6. Step 6: Final answer
    x = 644.32

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.