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Finding the Third Proportional to 5,121 and 6,870

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Solution

The third proportional to 5,121 and 6,870 is: 9,216.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,121 : 6,870 = 6,870 : x
  2. Step 2: Convert to fraction form
    5,121/6,870 = 6,870/x
  3. Step 3: Cross multiply
    5,121x = 6,870 × 6,870
  4. Step 4: Simplify right side
    5,121x = 47,196,900
  5. Step 5: Solve for x
    x = 47,196,900/5,121
  6. Step 6: Final answer
    x = 9,216.34

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.