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Finding the Third Proportional to 39,972 and 87,396

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Solution

The third proportional to 39,972 and 87,396 is: 191,085.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,972 : 87,396 = 87,396 : x
  2. Step 2: Convert to fraction form
    39,972/87,396 = 87,396/x
  3. Step 3: Cross multiply
    39,972x = 87,396 × 87,396
  4. Step 4: Simplify right side
    39,972x = 7,638,060,816
  5. Step 5: Solve for x
    x = 7,638,060,816/39,972
  6. Step 6: Final answer
    x = 191,085.28

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.