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Finding the Third Proportional to 872 and 1,356

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Solution

The third proportional to 872 and 1,356 is: 2,108.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    872 : 1,356 = 1,356 : x
  2. Step 2: Convert to fraction form
    872/1,356 = 1,356/x
  3. Step 3: Cross multiply
    872x = 1,356 × 1,356
  4. Step 4: Simplify right side
    872x = 1,838,736
  5. Step 5: Solve for x
    x = 1,838,736/872
  6. Step 6: Final answer
    x = 2,108.64

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.