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Finding the Third Proportional to 30.38 and 63.91

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Solution

The third proportional to 30.38 and 63.91 is: 134.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.38 : 63.91 = 63.91 : x
  2. Step 2: Convert to fraction form
    30.38/63.91 = 63.91/x
  3. Step 3: Cross multiply
    30.38x = 63.91 × 63.91
  4. Step 4: Simplify right side
    30.38x = 4,085.01
  5. Step 5: Solve for x
    x = 4,085.01/30.38
  6. Step 6: Final answer
    x = 134.49

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.