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Finding the Fourth Proportional to 490.29, 676.56 and 280.45

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Solution

The fourth proportional to 490.29, 676.56 and 280.45 is: 387.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.29 : 676.56 = 280.45 : x
  2. Step 2: Convert to fraction form
    490.29/676.56 = 280.45/x
  3. Step 3: Cross multiply
    490.29x = 676.56 × 280.45
  4. Step 4: Simplify right side
    490.29x = 189,741.25
  5. Step 5: Solve for x
    x = 189,741.25/490.29
  6. Step 6: Final answer
    x = 387.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.