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Finding the Third Proportional to 431 and 1,163

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Solution

The third proportional to 431 and 1,163 is: 3,138.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    431 : 1,163 = 1,163 : x
  2. Step 2: Convert to fraction form
    431/1,163 = 1,163/x
  3. Step 3: Cross multiply
    431x = 1,163 × 1,163
  4. Step 4: Simplify right side
    431x = 1,352,569
  5. Step 5: Solve for x
    x = 1,352,569/431
  6. Step 6: Final answer
    x = 3,138.21

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Why These Related Problems?

These problems maintain the same ratio (2.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.