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Finding the Third Proportional to 218.81 and 316.69

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Solution

The third proportional to 218.81 and 316.69 is: 458.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.81 : 316.69 = 316.69 : x
  2. Step 2: Convert to fraction form
    218.81/316.69 = 316.69/x
  3. Step 3: Cross multiply
    218.81x = 316.69 × 316.69
  4. Step 4: Simplify right side
    218.81x = 100,290.97
  5. Step 5: Solve for x
    x = 100,290.97/218.81
  6. Step 6: Final answer
    x = 458.34

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.