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Finding the Fourth Proportional to 490.40, 662.40 and 490.40

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Solution

The fourth proportional to 490.40, 662.40 and 490.40 is: 662.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.40 : 662.40 = 490.40 : x
  2. Step 2: Convert to fraction form
    490.40/662.40 = 490.40/x
  3. Step 3: Cross multiply
    490.40x = 662.40 × 490.40
  4. Step 4: Simplify right side
    490.40x = 324,840.96
  5. Step 5: Solve for x
    x = 324,840.96/490.40
  6. Step 6: Final answer
    x = 662.40

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.