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Finding the Third Proportional to 30.72 and 64.97

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Solution

The third proportional to 30.72 and 64.97 is: 137.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.72 : 64.97 = 64.97 : x
  2. Step 2: Convert to fraction form
    30.72/64.97 = 64.97/x
  3. Step 3: Cross multiply
    30.72x = 64.97 × 64.97
  4. Step 4: Simplify right side
    30.72x = 4,220.94
  5. Step 5: Solve for x
    x = 4,220.94/30.72
  6. Step 6: Final answer
    x = 137.41

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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.