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Finding the Third Proportional to 392 and 842

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Solution

The third proportional to 392 and 842 is: 1,808.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    392 : 842 = 842 : x
  2. Step 2: Convert to fraction form
    392/842 = 842/x
  3. Step 3: Cross multiply
    392x = 842 × 842
  4. Step 4: Simplify right side
    392x = 708,964
  5. Step 5: Solve for x
    x = 708,964/392
  6. Step 6: Final answer
    x = 1,808.58

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.