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Finding the Third Proportional to 30.69 and 66.31

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Solution

The third proportional to 30.69 and 66.31 is: 143.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.69 : 66.31 = 66.31 : x
  2. Step 2: Convert to fraction form
    30.69/66.31 = 66.31/x
  3. Step 3: Cross multiply
    30.69x = 66.31 × 66.31
  4. Step 4: Simplify right side
    30.69x = 4,397.35
  5. Step 5: Solve for x
    x = 4,397.35/30.69
  6. Step 6: Final answer
    x = 143.29

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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.