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Finding the Third Proportional to 55.81 and 121.69

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Solution

The third proportional to 55.81 and 121.69 is: 265.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.81 : 121.69 = 121.69 : x
  2. Step 2: Convert to fraction form
    55.81/121.69 = 121.69/x
  3. Step 3: Cross multiply
    55.81x = 121.69 × 121.69
  4. Step 4: Simplify right side
    55.81x = 14,807.85
  5. Step 5: Solve for x
    x = 14,807.85/55.81
  6. Step 6: Final answer
    x = 265.31

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.