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Finding the Third Proportional to 691 and 1,155

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Solution

The third proportional to 691 and 1,155 is: 1,930.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    691 : 1,155 = 1,155 : x
  2. Step 2: Convert to fraction form
    691/1,155 = 1,155/x
  3. Step 3: Cross multiply
    691x = 1,155 × 1,155
  4. Step 4: Simplify right side
    691x = 1,334,025
  5. Step 5: Solve for x
    x = 1,334,025/691
  6. Step 6: Final answer
    x = 1,930.57

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.