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Finding the Third Proportional to 990.98 and 2,118.66

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Solution

The third proportional to 990.98 and 2,118.66 is: 4,529.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.98 : 2,118.66 = 2,118.66 : x
  2. Step 2: Convert to fraction form
    990.98/2,118.66 = 2,118.66/x
  3. Step 3: Cross multiply
    990.98x = 2,118.66 × 2,118.66
  4. Step 4: Simplify right side
    990.98x = 4,488,704.31
  5. Step 5: Solve for x
    x = 4,488,704.31/990.98
  6. Step 6: Final answer
    x = 4,529.54

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.