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Finding the Third Proportional to 30,791 and 66,389

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Solution

The third proportional to 30,791 and 66,389 is: 143,142.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,791 : 66,389 = 66,389 : x
  2. Step 2: Convert to fraction form
    30,791/66,389 = 66,389/x
  3. Step 3: Cross multiply
    30,791x = 66,389 × 66,389
  4. Step 4: Simplify right side
    30,791x = 4,407,499,321
  5. Step 5: Solve for x
    x = 4,407,499,321/30,791
  6. Step 6: Final answer
    x = 143,142.45

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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.