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Finding the Third Proportional to 921.56 and 1,990.31

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Solution

The third proportional to 921.56 and 1,990.31 is: 4,298.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.56 : 1,990.31 = 1,990.31 : x
  2. Step 2: Convert to fraction form
    921.56/1,990.31 = 1,990.31/x
  3. Step 3: Cross multiply
    921.56x = 1,990.31 × 1,990.31
  4. Step 4: Simplify right side
    921.56x = 3,961,343.85
  5. Step 5: Solve for x
    x = 3,961,343.85/921.56
  6. Step 6: Final answer
    x = 4,298.51

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.