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Finding the Third Proportional to 30.38 and 64.88

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Solution

The third proportional to 30.38 and 64.88 is: 138.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.38 : 64.88 = 64.88 : x
  2. Step 2: Convert to fraction form
    30.38/64.88 = 64.88/x
  3. Step 3: Cross multiply
    30.38x = 64.88 × 64.88
  4. Step 4: Simplify right side
    30.38x = 4,208.77
  5. Step 5: Solve for x
    x = 4,208.77/30.38
  6. Step 6: Final answer
    x = 138.56

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.