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Finding the Third Proportional to 51,378 and 76,720

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Solution

The third proportional to 51,378 and 76,720 is: 114,561.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,378 : 76,720 = 76,720 : x
  2. Step 2: Convert to fraction form
    51,378/76,720 = 76,720/x
  3. Step 3: Cross multiply
    51,378x = 76,720 × 76,720
  4. Step 4: Simplify right side
    51,378x = 5,885,958,400
  5. Step 5: Solve for x
    x = 5,885,958,400/51,378
  6. Step 6: Final answer
    x = 114,561.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.