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Finding the Third Proportional to 257.55 and 409.43

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Solution

The third proportional to 257.55 and 409.43 is: 650.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.55 : 409.43 = 409.43 : x
  2. Step 2: Convert to fraction form
    257.55/409.43 = 409.43/x
  3. Step 3: Cross multiply
    257.55x = 409.43 × 409.43
  4. Step 4: Simplify right side
    257.55x = 167,632.67
  5. Step 5: Solve for x
    x = 167,632.67/257.55
  6. Step 6: Final answer
    x = 650.86

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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.