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Finding the Third Proportional to 39,679 and 86,972

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Solution

The third proportional to 39,679 and 86,972 is: 190,633.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,679 : 86,972 = 86,972 : x
  2. Step 2: Convert to fraction form
    39,679/86,972 = 86,972/x
  3. Step 3: Cross multiply
    39,679x = 86,972 × 86,972
  4. Step 4: Simplify right side
    39,679x = 7,564,128,784
  5. Step 5: Solve for x
    x = 7,564,128,784/39,679
  6. Step 6: Final answer
    x = 190,633.05

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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.