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Finding the Third Proportional to 218.25 and 315.63

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Solution

The third proportional to 218.25 and 315.63 is: 456.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.25 : 315.63 = 315.63 : x
  2. Step 2: Convert to fraction form
    218.25/315.63 = 315.63/x
  3. Step 3: Cross multiply
    218.25x = 315.63 × 315.63
  4. Step 4: Simplify right side
    218.25x = 99,619.14
  5. Step 5: Solve for x
    x = 99,619.14/218.25
  6. Step 6: Final answer
    x = 456.45

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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.