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Finding the Third Proportional to 4,870 and 8,121

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Solution

The third proportional to 4,870 and 8,121 is: 13,542.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,870 : 8,121 = 8,121 : x
  2. Step 2: Convert to fraction form
    4,870/8,121 = 8,121/x
  3. Step 3: Cross multiply
    4,870x = 8,121 × 8,121
  4. Step 4: Simplify right side
    4,870x = 65,950,641
  5. Step 5: Solve for x
    x = 65,950,641/4,870
  6. Step 6: Final answer
    x = 13,542.23

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.