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Finding the Fourth Proportional to 608.61, 839.92 and 399.23

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Solution

The fourth proportional to 608.61, 839.92 and 399.23 is: 550.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.61 : 839.92 = 399.23 : x
  2. Step 2: Convert to fraction form
    608.61/839.92 = 399.23/x
  3. Step 3: Cross multiply
    608.61x = 839.92 × 399.23
  4. Step 4: Simplify right side
    608.61x = 335,319.96
  5. Step 5: Solve for x
    x = 335,319.96/608.61
  6. Step 6: Final answer
    x = 550.96

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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.