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Finding the Third Proportional to 990.88 and 2,138.13

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Solution

The third proportional to 990.88 and 2,138.13 is: 4,613.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.88 : 2,138.13 = 2,138.13 : x
  2. Step 2: Convert to fraction form
    990.88/2,138.13 = 2,138.13/x
  3. Step 3: Cross multiply
    990.88x = 2,138.13 × 2,138.13
  4. Step 4: Simplify right side
    990.88x = 4,571,578.52
  5. Step 5: Solve for x
    x = 4,571,578.52/990.88
  6. Step 6: Final answer
    x = 4,613.68

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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.