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Finding the Third Proportional to 78,720 and 169,881

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Solution

The third proportional to 78,720 and 169,881 is: 366,610.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720 : 169,881 = 169,881 : x
  2. Step 2: Convert to fraction form
    78,720/169,881 = 169,881/x
  3. Step 3: Cross multiply
    78,720x = 169,881 × 169,881
  4. Step 4: Simplify right side
    78,720x = 28,859,554,161
  5. Step 5: Solve for x
    x = 28,859,554,161/78,720
  6. Step 6: Final answer
    x = 366,610.19

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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.