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Finding the Third Proportional to 56.75 and 121.38

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Solution

The third proportional to 56.75 and 121.38 is: 259.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.75 : 121.38 = 121.38 : x
  2. Step 2: Convert to fraction form
    56.75/121.38 = 121.38/x
  3. Step 3: Cross multiply
    56.75x = 121.38 × 121.38
  4. Step 4: Simplify right side
    56.75x = 14,731.89
  5. Step 5: Solve for x
    x = 14,731.89/56.75
  6. Step 6: Final answer
    x = 259.59

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.