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Finding the Third Proportional to 121.44 and 256.38

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Solution

The third proportional to 121.44 and 256.38 is: 541.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.44 : 256.38 = 256.38 : x
  2. Step 2: Convert to fraction form
    121.44/256.38 = 256.38/x
  3. Step 3: Cross multiply
    121.44x = 256.38 × 256.38
  4. Step 4: Simplify right side
    121.44x = 65,728.14
  5. Step 5: Solve for x
    x = 65,728.14/121.44
  6. Step 6: Final answer
    x = 541.25

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.