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Finding the Third Proportional to 490 and 654

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Solution

The third proportional to 490 and 654 is: 872.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    490 : 654 = 654 : x
  2. Step 2: Convert to fraction form
    490/654 = 654/x
  3. Step 3: Cross multiply
    490x = 654 × 654
  4. Step 4: Simplify right side
    490x = 427,716
  5. Step 5: Solve for x
    x = 427,716/490
  6. Step 6: Final answer
    x = 872.89

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These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.