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Finding the Third Proportional to 120.75 and 213.50

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Solution

The third proportional to 120.75 and 213.50 is: 377.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.75 : 213.50 = 213.50 : x
  2. Step 2: Convert to fraction form
    120.75/213.50 = 213.50/x
  3. Step 3: Cross multiply
    120.75x = 213.50 × 213.50
  4. Step 4: Simplify right side
    120.75x = 45,582.25
  5. Step 5: Solve for x
    x = 45,582.25/120.75
  6. Step 6: Final answer
    x = 377.49

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Why These Related Problems?

These problems maintain the same ratio (1.77) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.