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Finding the Third Proportional to 77,786 and 117,391

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Solution

The third proportional to 77,786 and 117,391 is: 177,161.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,786 : 117,391 = 117,391 : x
  2. Step 2: Convert to fraction form
    77,786/117,391 = 117,391/x
  3. Step 3: Cross multiply
    77,786x = 117,391 × 117,391
  4. Step 4: Simplify right side
    77,786x = 13,780,646,881
  5. Step 5: Solve for x
    x = 13,780,646,881/77,786
  6. Step 6: Final answer
    x = 177,161.02

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.