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Finding the Third Proportional to 30.48 and 65.81

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Solution

The third proportional to 30.48 and 65.81 is: 142.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.48 : 65.81 = 65.81 : x
  2. Step 2: Convert to fraction form
    30.48/65.81 = 65.81/x
  3. Step 3: Cross multiply
    30.48x = 65.81 × 65.81
  4. Step 4: Simplify right side
    30.48x = 4,331.29
  5. Step 5: Solve for x
    x = 4,331.29/30.48
  6. Step 6: Final answer
    x = 142.10

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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.