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Finding the Third Proportional to 691.88 and 1,520.25

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Solution

The third proportional to 691.88 and 1,520.25 is: 3,340.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.88 : 1,520.25 = 1,520.25 : x
  2. Step 2: Convert to fraction form
    691.88/1,520.25 = 1,520.25/x
  3. Step 3: Cross multiply
    691.88x = 1,520.25 × 1,520.25
  4. Step 4: Simplify right side
    691.88x = 2,311,160.06
  5. Step 5: Solve for x
    x = 2,311,160.06/691.88
  6. Step 6: Final answer
    x = 3,340.43

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.