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Finding the Third Proportional to 77,420 and 115,828

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Solution

The third proportional to 77,420 and 115,828 is: 173,290.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,420 : 115,828 = 115,828 : x
  2. Step 2: Convert to fraction form
    77,420/115,828 = 115,828/x
  3. Step 3: Cross multiply
    77,420x = 115,828 × 115,828
  4. Step 4: Simplify right side
    77,420x = 13,416,125,584
  5. Step 5: Solve for x
    x = 13,416,125,584/77,420
  6. Step 6: Final answer
    x = 173,290.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.