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Finding the Third Proportional to 490 and 692

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Solution

The third proportional to 490 and 692 is: 977.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    490 : 692 = 692 : x
  2. Step 2: Convert to fraction form
    490/692 = 692/x
  3. Step 3: Cross multiply
    490x = 692 × 692
  4. Step 4: Simplify right side
    490x = 478,864
  5. Step 5: Solve for x
    x = 478,864/490
  6. Step 6: Final answer
    x = 977.27

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.