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Finding the Third Proportional to 51 and 71.81

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Solution

The third proportional to 51 and 71.81 is: 101.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    51 : 71.81 = 71.81 : x
  2. Step 2: Convert to fraction form
    51/71.81 = 71.81/x
  3. Step 3: Cross multiply
    51x = 71.81 × 71.81
  4. Step 4: Simplify right side
    51x = 5,157.04
  5. Step 5: Solve for x
    x = 5,157.04/51
  6. Step 6: Final answer
    x = 101.12

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.