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Finding the Third Proportional to 51,288 and 78,728

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Solution

The third proportional to 51,288 and 78,728 is: 120,848.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,288 : 78,728 = 78,728 : x
  2. Step 2: Convert to fraction form
    51,288/78,728 = 78,728/x
  3. Step 3: Cross multiply
    51,288x = 78,728 × 78,728
  4. Step 4: Simplify right side
    51,288x = 6,198,097,984
  5. Step 5: Solve for x
    x = 6,198,097,984/51,288
  6. Step 6: Final answer
    x = 120,848.89

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.