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Finding the Third Proportional to 405.75 and 629.50

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Solution

The third proportional to 405.75 and 629.50 is: 976.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.75 : 629.50 = 629.50 : x
  2. Step 2: Convert to fraction form
    405.75/629.50 = 629.50/x
  3. Step 3: Cross multiply
    405.75x = 629.50 × 629.50
  4. Step 4: Simplify right side
    405.75x = 396,270.25
  5. Step 5: Solve for x
    x = 396,270.25/405.75
  6. Step 6: Final answer
    x = 976.64

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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.