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Finding the Third Proportional to 981 and 2,145

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Solution

The third proportional to 981 and 2,145 is: 4,690.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    981 : 2,145 = 2,145 : x
  2. Step 2: Convert to fraction form
    981/2,145 = 2,145/x
  3. Step 3: Cross multiply
    981x = 2,145 × 2,145
  4. Step 4: Simplify right side
    981x = 4,601,025
  5. Step 5: Solve for x
    x = 4,601,025/981
  6. Step 6: Final answer
    x = 4,690.14

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.