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Finding the Third Proportional to 123.75 and 220.50

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Solution

The third proportional to 123.75 and 220.50 is: 392.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.75 : 220.50 = 220.50 : x
  2. Step 2: Convert to fraction form
    123.75/220.50 = 220.50/x
  3. Step 3: Cross multiply
    123.75x = 220.50 × 220.50
  4. Step 4: Simplify right side
    123.75x = 48,620.25
  5. Step 5: Solve for x
    x = 48,620.25/123.75
  6. Step 6: Final answer
    x = 392.89

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.