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Finding the Third Proportional to 7,810 and 10,987

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Solution

The third proportional to 7,810 and 10,987 is: 15,456.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,810 : 10,987 = 10,987 : x
  2. Step 2: Convert to fraction form
    7,810/10,987 = 10,987/x
  3. Step 3: Cross multiply
    7,810x = 10,987 × 10,987
  4. Step 4: Simplify right side
    7,810x = 120,714,169
  5. Step 5: Solve for x
    x = 120,714,169/7,810
  6. Step 6: Final answer
    x = 15,456.36

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.