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Finding the Fourth Proportional to 490.81, 677.60 and 325.30

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Solution

The fourth proportional to 490.81, 677.60 and 325.30 is: 449.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.81 : 677.60 = 325.30 : x
  2. Step 2: Convert to fraction form
    490.81/677.60 = 325.30/x
  3. Step 3: Cross multiply
    490.81x = 677.60 × 325.30
  4. Step 4: Simplify right side
    490.81x = 220,423.28
  5. Step 5: Solve for x
    x = 220,423.28/490.81
  6. Step 6: Final answer
    x = 449.10

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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.