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Finding the Third Proportional to 123.56 and 220.13

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Solution

The third proportional to 123.56 and 220.13 is: 392.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.56 : 220.13 = 220.13 : x
  2. Step 2: Convert to fraction form
    123.56/220.13 = 220.13/x
  3. Step 3: Cross multiply
    123.56x = 220.13 × 220.13
  4. Step 4: Simplify right side
    123.56x = 48,455.02
  5. Step 5: Solve for x
    x = 48,455.02/123.56
  6. Step 6: Final answer
    x = 392.15

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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.