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Finding the Third Proportional to 51,620 and 78,911

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Solution

The third proportional to 51,620 and 78,911 is: 120,630.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,620 : 78,911 = 78,911 : x
  2. Step 2: Convert to fraction form
    51,620/78,911 = 78,911/x
  3. Step 3: Cross multiply
    51,620x = 78,911 × 78,911
  4. Step 4: Simplify right side
    51,620x = 6,226,945,921
  5. Step 5: Solve for x
    x = 6,226,945,921/51,620
  6. Step 6: Final answer
    x = 120,630.49

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.