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Finding the Third Proportional to 321.56 and 418.13

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Solution

The third proportional to 321.56 and 418.13 is: 543.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.56 : 418.13 = 418.13 : x
  2. Step 2: Convert to fraction form
    321.56/418.13 = 418.13/x
  3. Step 3: Cross multiply
    321.56x = 418.13 × 418.13
  4. Step 4: Simplify right side
    321.56x = 174,828.52
  5. Step 5: Solve for x
    x = 174,828.52/321.56
  6. Step 6: Final answer
    x = 543.68

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.