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Finding the Third Proportional to 990.50 and 2,200

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Solution

The third proportional to 990.50 and 2,200 is: 4,886.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.50 : 2,200 = 2,200 : x
  2. Step 2: Convert to fraction form
    990.50/2,200 = 2,200/x
  3. Step 3: Cross multiply
    990.50x = 2,200 × 2,200
  4. Step 4: Simplify right side
    990.50x = 4,840,000
  5. Step 5: Solve for x
    x = 4,840,000/990.50
  6. Step 6: Final answer
    x = 4,886.42

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.