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Finding the Fourth Proportional to 608.28, 839.44 and 398.56

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Solution

The fourth proportional to 608.28, 839.44 and 398.56 is: 550.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.28 : 839.44 = 398.56 : x
  2. Step 2: Convert to fraction form
    608.28/839.44 = 398.56/x
  3. Step 3: Cross multiply
    608.28x = 839.44 × 398.56
  4. Step 4: Simplify right side
    608.28x = 334,567.21
  5. Step 5: Solve for x
    x = 334,567.21/608.28
  6. Step 6: Final answer
    x = 550.02

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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.