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Finding the Third Proportional to 691.88 and 1,491.75

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Solution

The third proportional to 691.88 and 1,491.75 is: 3,216.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.88 : 1,491.75 = 1,491.75 : x
  2. Step 2: Convert to fraction form
    691.88/1,491.75 = 1,491.75/x
  3. Step 3: Cross multiply
    691.88x = 1,491.75 × 1,491.75
  4. Step 4: Simplify right side
    691.88x = 2,225,318.06
  5. Step 5: Solve for x
    x = 2,225,318.06/691.88
  6. Step 6: Final answer
    x = 3,216.36

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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.