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Finding the Third Proportional to 3,121 and 4,787

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Solution

The third proportional to 3,121 and 4,787 is: 7,342.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121 : 4,787 = 4,787 : x
  2. Step 2: Convert to fraction form
    3,121/4,787 = 4,787/x
  3. Step 3: Cross multiply
    3,121x = 4,787 × 4,787
  4. Step 4: Simplify right side
    3,121x = 22,915,369
  5. Step 5: Solve for x
    x = 22,915,369/3,121
  6. Step 6: Final answer
    x = 7,342.32

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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.