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Finding the Third Proportional to 668 and 1,118

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Solution

The third proportional to 668 and 1,118 is: 1,871.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    668 : 1,118 = 1,118 : x
  2. Step 2: Convert to fraction form
    668/1,118 = 1,118/x
  3. Step 3: Cross multiply
    668x = 1,118 × 1,118
  4. Step 4: Simplify right side
    668x = 1,249,924
  5. Step 5: Solve for x
    x = 1,249,924/668
  6. Step 6: Final answer
    x = 1,871.14

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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.