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Finding the Third Proportional to 917 and 1,990

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Solution

The third proportional to 917 and 1,990 is: 4,318.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    917 : 1,990 = 1,990 : x
  2. Step 2: Convert to fraction form
    917/1,990 = 1,990/x
  3. Step 3: Cross multiply
    917x = 1,990 × 1,990
  4. Step 4: Simplify right side
    917x = 3,960,100
  5. Step 5: Solve for x
    x = 3,960,100/917
  6. Step 6: Final answer
    x = 4,318.54

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.