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Finding the Third Proportional to 30.38 and 65.72

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Solution

The third proportional to 30.38 and 65.72 is: 142.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.38 : 65.72 = 65.72 : x
  2. Step 2: Convert to fraction form
    30.38/65.72 = 65.72/x
  3. Step 3: Cross multiply
    30.38x = 65.72 × 65.72
  4. Step 4: Simplify right side
    30.38x = 4,318.95
  5. Step 5: Solve for x
    x = 4,318.95/30.38
  6. Step 6: Final answer
    x = 142.19

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.