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Finding the Third Proportional to 51,422 and 77,680

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Solution

The third proportional to 51,422 and 77,680 is: 117,346.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,422 : 77,680 = 77,680 : x
  2. Step 2: Convert to fraction form
    51,422/77,680 = 77,680/x
  3. Step 3: Cross multiply
    51,422x = 77,680 × 77,680
  4. Step 4: Simplify right side
    51,422x = 6,034,182,400
  5. Step 5: Solve for x
    x = 6,034,182,400/51,422
  6. Step 6: Final answer
    x = 117,346.32

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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.