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Finding the Third Proportional to 991.50 and 2,103

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Solution

The third proportional to 991.50 and 2,103 is: 4,460.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.50 : 2,103 = 2,103 : x
  2. Step 2: Convert to fraction form
    991.50/2,103 = 2,103/x
  3. Step 3: Cross multiply
    991.50x = 2,103 × 2,103
  4. Step 4: Simplify right side
    991.50x = 4,422,609
  5. Step 5: Solve for x
    x = 4,422,609/991.50
  6. Step 6: Final answer
    x = 4,460.52

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.