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Finding the Third Proportional to 668 and 1,136

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Solution

The third proportional to 668 and 1,136 is: 1,931.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    668 : 1,136 = 1,136 : x
  2. Step 2: Convert to fraction form
    668/1,136 = 1,136/x
  3. Step 3: Cross multiply
    668x = 1,136 × 1,136
  4. Step 4: Simplify right side
    668x = 1,290,496
  5. Step 5: Solve for x
    x = 1,290,496/668
  6. Step 6: Final answer
    x = 1,931.88

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.