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Finding the Third Proportional to 456 and 485.25

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Solution

The third proportional to 456 and 485.25 is: 516.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    456 : 485.25 = 485.25 : x
  2. Step 2: Convert to fraction form
    456/485.25 = 485.25/x
  3. Step 3: Cross multiply
    456x = 485.25 × 485.25
  4. Step 4: Simplify right side
    456x = 235,467.56
  5. Step 5: Solve for x
    x = 235,467.56/456
  6. Step 6: Final answer
    x = 516.38

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Why These Related Problems?

These problems maintain the same ratio (1.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.