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Finding the Third Proportional to 78,815 and 170,739

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Solution

The third proportional to 78,815 and 170,739 is: 369,876.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,815 : 170,739 = 170,739 : x
  2. Step 2: Convert to fraction form
    78,815/170,739 = 170,739/x
  3. Step 3: Cross multiply
    78,815x = 170,739 × 170,739
  4. Step 4: Simplify right side
    78,815x = 29,151,806,121
  5. Step 5: Solve for x
    x = 29,151,806,121/78,815
  6. Step 6: Final answer
    x = 369,876.37

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.