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Finding the Third Proportional to 75.78 and 113.43

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Solution

The third proportional to 75.78 and 113.43 is: 169.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.78 : 113.43 = 113.43 : x
  2. Step 2: Convert to fraction form
    75.78/113.43 = 113.43/x
  3. Step 3: Cross multiply
    75.78x = 113.43 × 113.43
  4. Step 4: Simplify right side
    75.78x = 12,866.74
  5. Step 5: Solve for x
    x = 12,866.74/75.78
  6. Step 6: Final answer
    x = 169.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.