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Finding the Third Proportional to 39,879 and 87,417

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Solution

The third proportional to 39,879 and 87,417 is: 191,622.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,879 : 87,417 = 87,417 : x
  2. Step 2: Convert to fraction form
    39,879/87,417 = 87,417/x
  3. Step 3: Cross multiply
    39,879x = 87,417 × 87,417
  4. Step 4: Simplify right side
    39,879x = 7,641,731,889
  5. Step 5: Solve for x
    x = 7,641,731,889/39,879
  6. Step 6: Final answer
    x = 191,622.96

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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.