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Finding the Third Proportional to 921 and 1,980

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Solution

The third proportional to 921 and 1,980 is: 4,256.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    921 : 1,980 = 1,980 : x
  2. Step 2: Convert to fraction form
    921/1,980 = 1,980/x
  3. Step 3: Cross multiply
    921x = 1,980 × 1,980
  4. Step 4: Simplify right side
    921x = 3,920,400
  5. Step 5: Solve for x
    x = 3,920,400/921
  6. Step 6: Final answer
    x = 4,256.68

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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.