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Finding the Third Proportional to 100.78 and 218.44

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Solution

The third proportional to 100.78 and 218.44 is: 473.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.78 : 218.44 = 218.44 : x
  2. Step 2: Convert to fraction form
    100.78/218.44 = 218.44/x
  3. Step 3: Cross multiply
    100.78x = 218.44 × 218.44
  4. Step 4: Simplify right side
    100.78x = 47,714.94
  5. Step 5: Solve for x
    x = 47,714.94/100.78
  6. Step 6: Final answer
    x = 473.45

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.