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Finding the Third Proportional to 318.66 and 403.69

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Solution

The third proportional to 318.66 and 403.69 is: 511.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.66 : 403.69 = 403.69 : x
  2. Step 2: Convert to fraction form
    318.66/403.69 = 403.69/x
  3. Step 3: Cross multiply
    318.66x = 403.69 × 403.69
  4. Step 4: Simplify right side
    318.66x = 162,963.60
  5. Step 5: Solve for x
    x = 162,963.60/318.66
  6. Step 6: Final answer
    x = 511.41

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.