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Finding the Third Proportional to 30.38 and 64.55

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Solution

The third proportional to 30.38 and 64.55 is: 137.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.38 : 64.55 = 64.55 : x
  2. Step 2: Convert to fraction form
    30.38/64.55 = 64.55/x
  3. Step 3: Cross multiply
    30.38x = 64.55 × 64.55
  4. Step 4: Simplify right side
    30.38x = 4,166.30
  5. Step 5: Solve for x
    x = 4,166.30/30.38
  6. Step 6: Final answer
    x = 137.16

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.