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Finding the Fourth Proportional to 608.11, 838.42 and 421.27

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Solution

The fourth proportional to 608.11, 838.42 and 421.27 is: 580.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.11 : 838.42 = 421.27 : x
  2. Step 2: Convert to fraction form
    608.11/838.42 = 421.27/x
  3. Step 3: Cross multiply
    608.11x = 838.42 × 421.27
  4. Step 4: Simplify right side
    608.11x = 353,198.04
  5. Step 5: Solve for x
    x = 353,198.04/608.11
  6. Step 6: Final answer
    x = 580.82

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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.