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Finding the Third Proportional to 77,778 and 117,381

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Solution

The third proportional to 77,778 and 117,381 is: 177,149.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,778 : 117,381 = 117,381 : x
  2. Step 2: Convert to fraction form
    77,778/117,381 = 117,381/x
  3. Step 3: Cross multiply
    77,778x = 117,381 × 117,381
  4. Step 4: Simplify right side
    77,778x = 13,778,299,161
  5. Step 5: Solve for x
    x = 13,778,299,161/77,778
  6. Step 6: Final answer
    x = 177,149.05

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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.