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Finding the Third Proportional to 30.56 and 65.91

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Solution

The third proportional to 30.56 and 65.91 is: 142.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.56 : 65.91 = 65.91 : x
  2. Step 2: Convert to fraction form
    30.56/65.91 = 65.91/x
  3. Step 3: Cross multiply
    30.56x = 65.91 × 65.91
  4. Step 4: Simplify right side
    30.56x = 4,343.63
  5. Step 5: Solve for x
    x = 4,343.63/30.56
  6. Step 6: Final answer
    x = 142.12

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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.