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Finding the Third Proportional to 39,510 and 86,121

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Solution

The third proportional to 39,510 and 86,121 is: 187,720.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,510 : 86,121 = 86,121 : x
  2. Step 2: Convert to fraction form
    39,510/86,121 = 86,121/x
  3. Step 3: Cross multiply
    39,510x = 86,121 × 86,121
  4. Step 4: Simplify right side
    39,510x = 7,416,826,641
  5. Step 5: Solve for x
    x = 7,416,826,641/39,510
  6. Step 6: Final answer
    x = 187,720.24

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.