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Finding the Third Proportional to 21,137 and 31,787

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Solution

The third proportional to 21,137 and 31,787 is: 47,803.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,137 : 31,787 = 31,787 : x
  2. Step 2: Convert to fraction form
    21,137/31,787 = 31,787/x
  3. Step 3: Cross multiply
    21,137x = 31,787 × 31,787
  4. Step 4: Simplify right side
    21,137x = 1,010,413,369
  5. Step 5: Solve for x
    x = 1,010,413,369/21,137
  6. Step 6: Final answer
    x = 47,803.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.