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Finding the Third Proportional to 1,213.78 and 1,539.56

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Solution

The third proportional to 1,213.78 and 1,539.56 is: 1,952.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.78 : 1,539.56 = 1,539.56 : x
  2. Step 2: Convert to fraction form
    1,213.78/1,539.56 = 1,539.56/x
  3. Step 3: Cross multiply
    1,213.78x = 1,539.56 × 1,539.56
  4. Step 4: Simplify right side
    1,213.78x = 2,370,252.69
  5. Step 5: Solve for x
    x = 2,370,252.69/1,213.78
  6. Step 6: Final answer
    x = 1,952.78

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.