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Finding the Third Proportional to 78,620 and 169,689

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Solution

The third proportional to 78,620 and 169,689 is: 366,247.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,620 : 169,689 = 169,689 : x
  2. Step 2: Convert to fraction form
    78,620/169,689 = 169,689/x
  3. Step 3: Cross multiply
    78,620x = 169,689 × 169,689
  4. Step 4: Simplify right side
    78,620x = 28,794,356,721
  5. Step 5: Solve for x
    x = 28,794,356,721/78,620
  6. Step 6: Final answer
    x = 366,247.22

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.