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Finding the Third Proportional to 31.36 and 68.53

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Solution

The third proportional to 31.36 and 68.53 is: 149.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.36 : 68.53 = 68.53 : x
  2. Step 2: Convert to fraction form
    31.36/68.53 = 68.53/x
  3. Step 3: Cross multiply
    31.36x = 68.53 × 68.53
  4. Step 4: Simplify right side
    31.36x = 4,696.53
  5. Step 5: Solve for x
    x = 4,696.53/31.36
  6. Step 6: Final answer
    x = 149.76

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.