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Finding the Third Proportional to 977.91 and 2,161.69

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Solution

The third proportional to 977.91 and 2,161.69 is: 4,778.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.91 : 2,161.69 = 2,161.69 : x
  2. Step 2: Convert to fraction form
    977.91/2,161.69 = 2,161.69/x
  3. Step 3: Cross multiply
    977.91x = 2,161.69 × 2,161.69
  4. Step 4: Simplify right side
    977.91x = 4,672,892.85
  5. Step 5: Solve for x
    x = 4,672,892.85/977.91
  6. Step 6: Final answer
    x = 4,778.47

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.