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Finding the Third Proportional to 403.88 and 516.38

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Solution

The third proportional to 403.88 and 516.38 is: 660.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.88 : 516.38 = 516.38 : x
  2. Step 2: Convert to fraction form
    403.88/516.38 = 516.38/x
  3. Step 3: Cross multiply
    403.88x = 516.38 × 516.38
  4. Step 4: Simplify right side
    403.88x = 266,643.14
  5. Step 5: Solve for x
    x = 266,643.14/403.88
  6. Step 6: Final answer
    x = 660.21

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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.