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Finding the Fourth Proportional to 418.20, 626.90 and 325.60

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Solution

The fourth proportional to 418.20, 626.90 and 325.60 is: 488.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.20 : 626.90 = 325.60 : x
  2. Step 2: Convert to fraction form
    418.20/626.90 = 325.60/x
  3. Step 3: Cross multiply
    418.20x = 626.90 × 325.60
  4. Step 4: Simplify right side
    418.20x = 204,118.64
  5. Step 5: Solve for x
    x = 204,118.64/418.20
  6. Step 6: Final answer
    x = 488.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.