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Finding the Fourth Proportional to 608.56, 839.60 and 422

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Solution

The fourth proportional to 608.56, 839.60 and 422 is: 582.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.56 : 839.60 = 422 : x
  2. Step 2: Convert to fraction form
    608.56/839.60 = 422/x
  3. Step 3: Cross multiply
    608.56x = 839.60 × 422
  4. Step 4: Simplify right side
    608.56x = 354,311.20
  5. Step 5: Solve for x
    x = 354,311.20/608.56
  6. Step 6: Final answer
    x = 582.21

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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.