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Finding the Third Proportional to 991.75 and 2,137

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Solution

The third proportional to 991.75 and 2,137 is: 4,604.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.75 : 2,137 = 2,137 : x
  2. Step 2: Convert to fraction form
    991.75/2,137 = 2,137/x
  3. Step 3: Cross multiply
    991.75x = 2,137 × 2,137
  4. Step 4: Simplify right side
    991.75x = 4,566,769
  5. Step 5: Solve for x
    x = 4,566,769/991.75
  6. Step 6: Final answer
    x = 4,604.76

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.