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Finding the Third Proportional to 238.78 and 521.44

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Solution

The third proportional to 238.78 and 521.44 is: 1,138.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.78 : 521.44 = 521.44 : x
  2. Step 2: Convert to fraction form
    238.78/521.44 = 521.44/x
  3. Step 3: Cross multiply
    238.78x = 521.44 × 521.44
  4. Step 4: Simplify right side
    238.78x = 271,897.07
  5. Step 5: Solve for x
    x = 271,897.07/238.78
  6. Step 6: Final answer
    x = 1,138.69

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.